<human>: Hey, 
My parents were married for ~30 years.
For the first 15 years, things were good, but then financial problems caused tensions in the family.

They fought every day, acted like assholes to each other, mom mostly reactionary. I suspect my father had at least 1 affair.

Things were bad for the last 15 years of their marriage, so my mom divorced him.

Now he blames her for all his mistakes, when he admits he made mistakes, otherwise he just sees things as just a downturn, other families recovered, why couldn't we, etc.

He says he's depressed and lonely, every time I see him we fight about the divorce, but I'm basically his only support, partly financially and emotionally.

He doesn't seem to be able to admit any part of the blame, even though most of it is his, and find outrageous excuses, implying things were planned years ahead, or there were other men, or other things like that. Which are all not true.

It's been 3 years since the divorce, so I'm starting to think he may have some kind of mental issue, or he's a very good manipulator. Don't know what to do with him. Did any of you experience similar issues?

Summarize the given text in a few sentences.
<bot>: Father acted like an asshole for 15 years, so my mother divorced him. Now he's depressed, thinks he hasn't done any harm, ever, and is complacent with himself. What to do?