It's so boring when women absolve other women of blame, when it comes to being with married men. As if women are automatons incapable of free will.
Both are to blame. You don't have to help someone break their vows, you don't have to help them break up their family, have their cake and eat it. It's not compulsory.
I've known friends be the OW, in some ways I can understand how it's happened, especially in one particular scenario.
But of those who stayed with the men - no, it isn't happy ever after. Seems it's a 7 year itch - in 1 friend's case, 15 years..& she's now a ball of suspicion that he's met someone else.
Of course I think, but - what's your issue, you met him in the same way...! Why are you worried if he's cheating?
I wouldn't tell her that though. It's her choice to make a fool of herself and not recognise once a cheat always a cheat.
Even if never caught, or caught years later then that's how it is. Why don't OWs just live with it. I don't see the big deal.
OP if you're asking for personal reasons - if you're not the type to want to share a man then at least you've had a lucky escape, whether you or he did the leaving. It may hurt for now but trust that it won't forever. You'll be ok eventually and be glad to be rid of all the disruption. Do stuff you like, look after yourself, and make a conscious effort to move on even when you don't feel like it.