How would you feel?

So recently my boyfriend of 3.5 years told me he and a friend are planning on moving in together in a few months. I do support it, 100%. Especially since I know the friend is having a lot of family problems. But when my boyfriend told me this, it kind of hurt my feelings. I've been telling him for at least a year that I would like to move out. My house is full of negative, my stepdad doesn't treat me well and just a lot of problems. And now that his friend wants to move out, he's all about it. I know it would be good for both of them, but at the same time my feelings are kind of hurt. Am I wrong for feeling this way? Like I do support them moving in together, I think it'll be good for them. But idk, I guess I don't know how to feel.