Friend keeps going back to a cheater

My friend starting dating this guy a few months ago and immediately moved in. Not the best choice but sometimes it works out and I didn't want to jump the gun. Everything seemed to be fine for the first couple months.

Then the complaining started. He plays video games constantly and they never do anything. She keeps getting BV. But she told me he's not circumcised and we both kinda figured it was maybe he didn't wash as well as he should. But I don't know.

Then she caught him fucking someone in his car. They decided to work out out after one day. I wouldn't have. But it's not my life. I told her I didn't necessarily support that choice but she's my friend and I'm going to be there for her.

Then less than he brings a drunk girl home a couple months later and she finds them in bed together. He swears nothing happened. She says nothing happened. Then after talking she says yes they did do things but she was too drunk to stop anything.

She still wants to work it out. What the actual hell? He's never gonna stop. He's always gonna be "sorry" about it. Ugh. I want to be there for my friend but how can I when I know the cycle will continue?

Anyway. He's garbage. She's damaged. I have no solutions. End rant.