Harry: One day you come to Moaning in you're bedroom. And it for sure weren't you're moans. When yoyu got to you're and Harry's room you were shocked at what you found. He was having sex with Ginny. Of all people it had to be you're ex-best friend. But what upset you the most was that Harry was cheating in general. You quietly closed the door again and ran to the living room to find a pen and paper. Writing a quick note you left it on the table in the kitchen, and rushed out of the house to you're car. 

Fred/George: You didn't have any problems in your relationship. That was what you thought at least. That was until your lover decided to just disapear. No note, car gone. You were left alone with your thoughts.

Draco: Your break up was sad but you undertood why it happened. You were a muggle that Draco had fallen in love with. After 3 months of dating, Draco's Father Lucius found out and forced him to call everything off. Instantly giving him a lecture about how you were lower than them and should be treated like that. 

Hermione: The only reason you broke u was because hermione spent more time reading books than actually spending time with you. She would sometimes say a "Hi", but thats it. 

Luna: There just would never be a break up cause she is a total sweetheaart. So calm and collective. It would pain you to break up.