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Anyway, even though I think it's a bad idea to be the one who decides their fate, any opinions on this would be appreciated. Thanks
It's a bad idea. Don't be stupid.
Look dude, this guys sounds like a mess. He's needy and insecure. He's jealous as fuck and apparently abusive. You don't need to do shit, he's pushing her away of his own with his repulsive behavior.
It's on her. Any woman that's even remotely worth your time will find it in her self to walk away from bad relationship. If she does, good. If however she's doesn't, that's because her own sense of self-worth is too low for her to think she can do better. And that's not the kind of woman you want in your life.
Just be the fun guy she couldn't resist in the first place and don't even mention the other dude. She has to be capable of standing on her own two feet. If one of you force her to make a choice, she'll eventually choose the one who didn't.