boyfriend problems help

Hey guys so my bf and I broke up last night and I haven't been sleeping I just been crying all night and day. Lately he just started acting careless and not being affectionate or loving as if I was invisible to him. This happened before and I know he's not with someone else or cheating. He says it's best for us to not be together because if we continue we are going to end up hating each other. When we talked it out he just said he wasn't doing well mentally that he gets into random moods that make him want to be distant. He's dealing with stuff at his job and also other drama. Idk what to do I really want to be him and work things out because we both love each other but he just says he wants to be together but he's mentally not there, what do you guys suggest I should do?