Hey everybody! Here is the final part, hope everyone likes it. I'd just like to say thank you for reading. It was really fun to sorta build my own plot.

...

Droplets of rain pelted Barry's skin as he stood, knocking on Caitlin's front door.

"Cait, " he called over the ambient sound of the storm, "Please, open up."

Barry knocked again, this time using his speed. After a few seconds, the door opened, revealing a disheveled and rushing Caitlin. She grabbed her purse with one hand, whilst holding her Bride's Maid dress in a dry-cleaner bag with the other.

"I know, I know, " Caitlin spoke hurriedly. "I'm ready, I can change into my dress when we get there."

Before Barry had a chance to say anything, Caitlin moved passed him and put the things in her car. The speedster found it shocking how she could seem so normal after everything. Then again, she had been hiding how she felt for who knows how long. Barry felt his chest tighten a little at the thought.

"Come on," Caitlin prompted, pulling him from his thoughts. "We're going to be late."

"No, we're not, " Barry replied, his tone even.

Caitlin looked down at her watch in confusion, the rain beginning to dampen her hair.

"Can't be late to something that's not happening, " Barry let out a nervous chuckle, failing in his attempt to put it lightly.

Caitlin furrowed her brow.

"We called it off, " Barry admitted, quieter this time.

All the blood drained from Caitlin's featured. "No," she breathed out.

"No, no, no, no," Caitlin began to pace. "I broke up a wedding!" She blurted, a note of panic in her tone.

Barry braced himself, he had a feeling she would blame herself.

"No, you didn't. Technically, I did," Barry corrected.

"Because of me!" Caitlin shot back.

"No. It wasn't your fault," Barry stepped forwarding, putting his hands on her arms to stop her from pacing.

"Listen, we talked it over," Barry assured. "It's all okay."

"You were ready to get married just a few hours ago, how can it be okay?" She answered.

"We both agreed, it just...didn't feel right," Barry stated.

Caitlin gave him a doubtful look, her posture still tense. She opened her mouth to speak again, but Barry cut her off.

"Let me explain," Barry pleaded.

Caitlin took a deep breath and nodded. He stopped for a moment to collect his thoughts, the rhythmic patter of the rain echoing all around him.

"For so many years, I loved Iris," He began. "I don't know why, maybe it was because she was the first person I really connected with after what happened to my parents. And...and I guess I just latched onto that," Barry continued, slowly pacing.

"I've held onto that for so many years, I've ignored so many other feelings, so many other relationships. I ignored every chance I had to move on. Because I thought being with Iris was the only way I'd be happy."

"But I'm not," he uttered, a sense of helplessness in his voice. "I haven't been happy for a long time."

"I was just so afraid, though," he confessed. "Afraid of what I could do the future. Afraid that maybe this really was my only chance. I was afraid of moving on,"Barry turned to Caitlin.

"And this didn't have anything to do with your future-self coming back?" Caitlin cut in.

"No," Barry replied, firmly.

"Yes," he added, "Maybe. I don't know. I guess when the world almost ends the first time you try to get married, and your future-self kidnaps you the second, you start to wonder." Barry let out a humorless laugh.

"The point is," the speedster continued. "Regardless of what he/I said, I'm tired of being unhappy."

"I wanna move on, and I don't want to be afraid anymore," Barry announced, determined.

For several moments the only sound that filled Barry's ears was the rain softly hitting the ground.

"Then I think you should," Caitlin gave him a small, yet sad smile, "But why are you telling me this?"

"Well, for one, I wanted you to hear it from me. I wanted to make sure you knew it wasn't your fault," Barry answered, leveling his gaze with hers.

"And two?" She ventured, the rain still falling between them.

Barry stared down at the ground, trying to put it into words. Wondering if he shouldn't say anything at all. Wondering if he should just make up an excuse and leave it alone. He'd caused enough damage already.

Finally, Barry looked back up at her, his eyes meeting Caitlin's. She looked at him for a moment, before it hit her.

As he watched her process it, Barry couldn't help but wonder if he was that transparent. Or maybe it was because she knew him that well. Either way, Pandora's Box had already been opened and there was no pointing in holding back now.

"You too?" Caitlin finally spoke up.

Barry nodded, a wistful look on his features.

"Barry, just because I..." she trailed off, running her hand over the back of her neck.

"That's not the reason," he reassured. "Like I said, I ignored a lot of feelings."

Caitlin walked over and leaned back against her car. She closed her eyes, as if she needed a moment to take everything in.

Barry didn't blame her. The speedster moved forward and did the same, leaning his head against the cool, slick surface.

"We're a mess," Caitlin eventually broke the silence.

"Yeah," a smile tugged at Barry's lip. "I guess we are."

"What do we do now? If anything. I...I mean where do we even go from here?" Caitlin stated, looking down.

"I think we should just wait and see what happens. We wait, and we talk," Barry suggested.

"We haven't talked enough lately. Let's just get coffee. Let's get coffee and talk," he echoed, putting his hands in his pockets.

"Coffee sounds nice," Caitlin agreed.

Barry released a breathe he didn't realize he was holding. She gave him a smile, the first genuine one he'd seen in a long time. Barry offered her his hand. Caitlin peered down at it for an instant, hesitant. Then finally she took it, her fingers lacing through his. Together, the two walked away.

Maybe things weren't perfect, and the future was still full of uncertainties. But together, there was something that neither of them had for a very long time.

There was hope.

...

Barry Allen sat on the edge of a building, watching as the younger versions of himself and Caitlin walked away. The rain had stopped and the sun was just beginning to drop below the horizon, casting platinum light on the adjacent storm clouds. All the while, Barry couldn't help but think how different 2017 was from 2030.

He knew they needed to get back, but she had wanted to see the sunset.

"Barry," Caitlin spoke from where she sat beside him, "Ever wonder why you came back?"

The question caught Barry off guard. "Well, like I said, I came back..."

"To make sure the past happened," she finished his sentence. "Then why did you look so upset?" Caitlin continued. "I mean when you went to talked to us."

"You know, I always remembered what I had to say, I rehearsed it even," Barry said, moving his knees to sit cross-legged. "But when I saw us, when I saw how different we were. How sad you were, I realized how much much pain it all caused you. I realized how much I would've regretted it if our lives had been different," Barry stated, his gaze flickering to the two figures as they became fainter in the distance. "So it just came naturally."

Caitlin gazed at him for a moment, a smile forming on her lips. "Have I ever told you how much I love you?"

"I think so," Barry scrunched his face in concentration, "But you better tell me again for good measure," he teased.

Caitlin playfully rolled her eyes at him.

"I love you."

"I love you too, Cait." Barry answered, planting a kiss on her lips.

Caitlin scooted closer to him and rested her head on his shoulder, watching as the sunlight slowly began to disappear.

"Why did you ask, by the way?" Barry inquired after a few moments.

"I don't know," Caitlin glanced down, fiddling with the hem of her jacket, "I guess I always thought you looked upset because something bad had happened, and you came back to change it."

"Wait a minute," Caitlin continued, "If you didn't come back because something bad happened, that means you didn't change anything at all. It's was..."

"A Causal Loop," Barry finished.

"The reason you came back, was because you came back," Caitlin added, astonishment in her words.

"My brain hurts now,"
Barry pressed his palms against his eyes and laid back on the damp roof.

Caitlin let out a laugh, laying down next to him. "Well, Causal Loop or not, I'm glad you did."

"I am too," he replied quietly, wrapping his arm around her shoulder.

Caitlin snuggled closer to him and rested her arm atop his chest.

"We are quite the pair aren't we, Mr. Allen."

"Yes we are, Dr. Allen."

The sun dropped below the horizon, and the pair watched as the evening sky slowly transitioned into night. They were happy. Maybe they didn't know what trails the future would hold, but they would get through it just as they had in the past.

Together.

The End

...

Okay so, I hope the Causal Loop thing wasn't too confusing. It pretty much boils down to what was explained. If it's still confusing I'd suggest looking it up, Dr. Who did a really good job of explaining it.

I would just like to say thank you once again! You guys are awesome.

So without further ado:

Ladies and gentleman, that's a wrap!