Losing close friends always sucks

It’s hard to let long-term friendships go, but this person sounds like they’re choosing to become shady and rationalizing those destructive actions with a superiority complex about other women. It’s a bad road. They often inevitably stab their friends in the back. You’re wise to put distance there.

Believe me, I've been there. I also had a close friend I met back when I was in college and sadly, we grew apart after nearly 10 years of friendship. Just remember that whenever one door closes, another one will open.

That’s a hard loss, yet she’s the one that made the choices even given the common sense you’ve pointed out.

Leave her come back to you if she changes . Leave that possibility. No one's perfect.
I know it's a hard one , but your friend seems very unwell , and if you close the friendship completely on her , and her being unwell , a possibility of her being unwell and maybe takes her own life , you'll have a lot more to deal with in just loosing a friendship . You'll have no peace for the rest of your life .
I know an affair is wrong .

It sounds like you did the smart thing by blocking her, she apparently became toxic.

I have been through this before and it feels like a piece was taken from you

[quote]My life has been much more peaceful.[/quote]

INR,

Sometimes you just have to 86 the drama......

People can grow together and people can grow apart. Sometimes someone just takes a different direction to you and you don't really notice it until your respective paths widen sufficiently. It's sad but it happens. Who someone once was will not always be who they remain and at that point you need to decide whether you still have anything in common. The past is great for memories but useless for moving forward except in learning lessons.