Search Results: boyfriend cheated with a friend

So I've had a friend for about 5 years. we've had our differences, usually we work it out.

My "friend" has been living a train wreck of a life that she's kinda forced on herself.
I usually set aside the fact that I feel like she's made a bad decision and try to help her through it.

But for starters, I lost my virginity to my boyfriend when I was 19, three months into our relationship. We've now been together for 4 years and we JUST got engaged this past weekend.
When I told this friend that I'd had sex (she'd never done it before either), she got a little "cold". All she said was is "I just don't understand why it couldn't wait for marriage." And essentially kinda made me feel bad for not waiting.
I ignored her for a few weeks, then she messaged me about HER boyfriend was cheating on her pretty blatantly. He'd go WEEKS without even sending her a TEXT. Nothing at all. And then randomly send her pictures of some half naked woman. Just to hurt said friend. So I felt bad for her, tried to talk to her, and I told her she needed out of that relationship. I tried to put it delicately, since she was "so in love." And she then SHE stopped talking to me.
Fast forward like 2 weeks and she tells me she had sex with him so he would cheat. (He didn't stop.) Well now 3 years later, I'm engaged, have a great job, just living my best life really.
3 years later for her is, she has had a baby with her cheater boyfriend. Not married or engaged, neither of them has a job, they don't even live together. Still with their parents.

When I told her I was engaged though she just couldn't be happy. Her exact words were "well me and John could be married by now, but there's just no point since we knows left we love each other".
So admittedly I snapped and replied "well that's so great that you changed your mind after you shamed me for having sex then turned around and had a baby with a guy you don't even live with."
She Left me on read and honestly I have nothing to say to her. AITA?

He hates garbage about cheaters, liars and hypocrites. His stance is ''be honest even if it hurts''. He has no respect for his last girlfriend that cheated on him for 4 months. He found out through others and had to surprise her with the evidence to get the truth out of her. He blocked her immediately and ignored her beggings.

My friend however told him last month that she would like an open, casual relationship... that she sometimes feels like dating others for fun while keeping him as her boyfriend. He thanked her for the honesty and has agreed to it. He still considers her a faithful girlfriend; saying that's a lot better than getting cheated on and having your time wasted.

His definition of a faithful, honest person is the one that has enough respect to tell you in your face, doesn't hide things and isn't misleading you. How about you, would you consider my friend a faithful girlfriend?