Help. Why am I so emotional?

So recently I've been just getting really down and telling my boyfriend I need all of his attention and when he don't it seems like he doesn't care. I then get super depressed and start crying my eyes out. But like he gives me all of his time. We live, sleep, eat, pee, shit and shower together everyday. It's like we're already super glued but I for some reason still feel like I get no attention from him? I know this isn't normal and I'm tired of getting super depressed. It's hard to bring myself up. I'm currently exercising because I'm not happy with my weight and I thought well maybe I'm just depressed because of how i look. But like idk. Anyways, is there something I can do to fix this? Hormone imbalance? Depression? What is it? I just want it to stop. It's ruining my relationship.