Shiro: 

Allura mostly. She's happy for Shiro and the fact that he had found someone that he likes. She knows the history behind you two and fully supports your relationship. 

Keith:

Shiro. He loves that you brought out a softer side to him and he has someone to make sure he doesn't go on any suicide missions. He had a tendency to do that in the past. Shiro knows you will protect Keith and he will do the same for you.

Lance:

Hunk. He was super ecstatic to see his best friend with a girl friend. After how hard Lance had been trying, it was time for him to have one. He accepted you as galran and promised to protect your relationship from all the haters.

Hunk:

Pidge. She thinks you guys make the ultimate couple. You two make the best food and would take care of each other. If he was sick, you would make him soup and scones to help him feel better. You wouldn't leave his side the whole way through. He would do the same for you. Pidge finds that too precious! She has snuck dozens of pictures of you two doing cute things together.

Matt:

All the rebels. Matt seemed a lot more relaxed and cheerful since you two started dating. You would hide less and became more helpful on missions because you knew it was important to Matt and his safety.