<human>: Can you summarize the given text in a few sentences?

My boyfriend had a very flirty relationship with one of his female friends/coworkers, to the point I consider it cheating. I gave him a second chance, but it's not just something I can forget obviously. 
I never feel good enough for my boyfriend anymore and just a bunch of other shit, but I can't talk to my boyfriend about it because he still feels awful about it.

Anyways, he's still friends with this girl because they work together. Everyone at his work are good friends, so if one person has a party then everyone is invited. It would be rude to exclude one of them.

My boyfriend really wants me to come to this party tonight, but I don't think I can do it. I told him I would go, but I'm thinking I'm just going to back out of it last second so he won't cancel the entire party..

So, would it be wrong for me just to stay home? And what do I tell him if I don't go?
<bot>: Am I wrong for not wanting to go to my boyfriends party since the girl he emotionally cheated on me with is going to be there?