I've got a huge problem

This is a long read. And I need REAL advice. Not flighty or irrelevant comments or bitchy remarks.

I work with this guy (he's directly beside me) so we've certainly become friends over the past 3 years when I started. I have never ever been attracted to him in a physical or sexual way. I just seem him as a friend who I can hang with at work or after work. There is no other relationship. We get along very well. And we honestly talk about everything. Politics. New cars. Home life. Things that make us mad. Things that make us sad. We laugh. We don't always agree on stuff but I have his back and he has mine.

He recently got married to a girl back in November who is also the mother of his 2 year old daughter.

And as per him, since they got married she has gone in his words insane. She just completely stopped going to work for no reason. She spends all of their money on stupid things. She bought a brand new car in August. And now he pays for it because she doesn't work (simply because she feels like she doesn't need to work) yet even though she stopped working in November, she still will take their daughter every single week day to the in home daycare that they use. Half the time she goes out with her friends, gets drunk and then he has to pick up their daughter from daycare and then go pick up her drunk ass. Literally happens once a week.

She's started taking anxiety medications and wakes up in the middle of the night screaming at him because in her dreams he cheats on her. Even though he doesn't. She forbids him from spending time with any of his guys. She threatens to call the police and say he's assaulted her if he goes out with his friends.

And he's spoken to me about divorce. And I feel so out of place for someone to have that kind of conversation with. And then he told me yesterday that he wishes he had met ME sooner and would divorce her for me in a heartbeat. And I was really bothered because she's his wife and she's not perfect but you should never disrespect the woman you married like that.

So please. What do you think he should Do?