When mine "leaves me", meaning "it's over"- hours after saying "I love you", and with weekend plans- he sits at home in the dark, watches TV, goes for drives, looks at photos and makes himself even more depressed.
I do trust him, I do not think he is out with other women. He sincerely believes that the world is better off without him-me, his kids, family, everyone when he is "down".
He was diagnosed as bipolar but has never gone on medication or counseling after the diagnosis. The longest time he can manage himself was just recently 3 weeks- during that time, he really thought things through before he spoke. One time I felt it coming (you know what I mean), and he took a deep breath, put his hands on my face and said "we can work through this, I am not going to push you away". I cried at the thought that this might be IT! We can be past this, get some help and get back to our lives. But yesterday he loved me, and by last night, we need to cut all communication and get on with our lives without each other.
I don't know what it is. But I believe that constant care is very much necessary, regardless of how they feel, good or bad. Counseling and medication is mandatory. Because we are not going to fix them with all the caring and love in the world.
We matter too.