Search Results: how can i get back at my boyfriend

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 am meeting with my boyfriend of a year who said we were on a "break" a month ago and ghosted me. During that time he hungout with this girl that during our relationship I told him he cannot talk to or we are done. They have done sexual things before and she sent me an extremely disrespectful text (disrespecting me and my boyfriend) 6 months ago. He wants to talk tomorrow (likely about getting back together). I really need either him to confess to me he saw her or I need to bring it up and clarify that if we do get back together he needs to cut her off permanently and he will not be going on "breaks" to talk to her every now and then if thats why he did this. His response to those needs is the deciding factor that is gonna make or break his chance of getting back together with me. The problem is this is his first relationship and he has a strong "fighting = broken relationship" thinking. And unfortunately I cannot bring up this topic without being mad and fighting about it. I was thinking of typing everything I want to say on a paper a bringing it with me and then being like "I don't know how to talk about this without fighting and I don't want to fight so please read this" and hand it to him. Would this be a good idea or weird/too much drama? Any other ideas? I just feel like if I bring it up by talking about it that it will lead to a negative conversation/fighting and I won't say the right things on the spot.