Depression & love making??

I used to have depression and recently due to a situation with my father I have "relapsed" I feel the way I did 3 years ago before I met my boyfriend. I've been with my boyfriend for 3 years and he's the man I want to marry. Having sex with him has always made me feel so strong and indescribable. It feels. Beautiful. We were making love. But after this recent event.Everytime I meet up with my man all I want to do is have sex. All we do is fucking. I can't help it. As soon as it's done. I just get my stuff and go. I don't want to sit around and talk or do anything. My boyfriend doesn't like it. I can see it in his face. Because we barely spend time anymore. The thing is I really am not in the mood to socialise or anything with him or anyone else. All I want from him is sex right now. Is this normal? Is this okay? How long will this last? Why do I do this? PLEASE HELP ME. I don't want to ruin us.