I'm pissed off and want to dip on my friend because a week ago he invited over my ex-girlfriend.
So your friend angered you by inviting your ex girlfriend to an event?
Yeah, I'm trying to avoid her but my friend doesn't respect that.
It's understandable to want to avoid an ex. Your friend should've respected that.
I want to do something to piss him off so that he won't ever invite her again. I'm fed up with this now.
Your friend may have done something to upset you, but his action may not have been out of malice. Just talk to him about how you feel before you do anything reckless.