He’s openly disrespectful, emotionally unavailable (or inconsistent at bare minimum), unfaithful and he has few real friends or ambitions besides sitting on his couch and doing drugs.
I honestly can’t tell if he’s attractive or not (although he’s clearly out of shape); he’s not exactly stupid but he’s clearly unwise and extremely irresponsible.
What does she in this guy? The only good things I can see him as a romantic partner are money and fame and she doesn’t seem like the type to obsess over that.
There’s a long answer, involving abuse and evasiveness and the Four F’s of trauma response (Fight, Flight, Fawn, and Breed).
But other comments go into the long, boring answer.
Short answer is Horse Cack.