Search Results: forgive my boyfriend for cheating

My best friend (WHO HAS A BOYFRIEND) of 6-7 years kissed a guy i used to hook up with.
Background
The guy and I had a horrible falling out, he said awful things and never apologized for them. My best friend has seen me cry over this guy. A year later he comes back to hanging around the friend group. I have a boyfriend now and i love him so much. The guy came up to me and said “we are cool” even though he never apologized so of course I hate him. He also tries so hard to become friends with my boyfriend, but of course he isn’t having it.
I just recently threw a party for my boyfriends birthday. The guy ended up showing up because of the mutual friends we have. Of course my boyfriend and I did everything in our power to avoid him all night, and he would still try and talk to me.
When I was dealing with a drunk person during the party my friend and the guy went to go get food. She got in his car!!! Of course it's the one time I wasn't in the room. Like an hour later they come back into the party with food, then my friend comes and stands next to me and doesn't say anything. There's also a chance they went to the bathroom together. The next day I ask her what happened and she admits that they kissed. She claimed she shut him down but then immediately contradicts herself with her next text. This is not the first time she has displayed “pick me” behavior
I guess it's just never been this bad. Her boyfriend emotionally cheated on her a month or 2 ago and ever since then she has been manipulating him. I also maybe feel sometimes she might be jealous of me, not on no cocky stuff.

The cheating aspect aside, do we think I should or. Ever can forgive her. Should jus let that bridge burn no matter how long we have been friends?

I actually felt sad for this infidelity story I've once read at Reddit. It was written 2 years ago. The woman was 39 (she must be 41 by now) and her now husband cheated on her with a co-worker. He spent some of his wife's money on the affair and took her homemade meals and desserts to secretly feed the other woman. He cheated as a 40 year-old married man with 3 kids. He ended up having a mid-life crisis and supposedly wanted to see what it was like having sex with another woman, even briefly fell in love with the other woman. She forgives and agrees to marriage counseling. She felt she owed him one and clearly wants to save the marriage.

Flashback to 2002 when they were just boyfriend and girlfriend:

When the woman was much younger (then 19 years old), she cheated on her then boyfriend (now husband) with his best friend Tony. He caught her in a compromised position, both asleep in the couch with the TV running on. Supposedly the guy was in boxers and she was with jeans on but only with bra on top. Apparently they had already finished doing the deed by then and there was alcohol. It was an affair going on for 3 months. She's been repentant for all those years, never cheated again and was faithful as a fiancee and wife. She got forgiven and (yes he still proposed 5 years after the cheating incident, claiming he forgave her completely and wouldn't bring it anymore) they still got married.

https://www.reddit.com/r/survivinginfidelity/comments/yozb12/my_husband_40_m_and_i_39_f_are_working_things_out/

On the woman's previous post, she actually is full of guilt all over again and feels she deserved it. Did she deserved to get cheated on 20 years later? She cheated in 2002 as a 19 year-old girlfriend with no kids. He cheated as a 40 year-old married man with 3 children?