Revenge

I was in a fwb with this guy for like 8 months . He wasn’t the best but not the worst either . He peed in my mouth as I was going down on me and said it was funny .i let it go for a few days and I confronted him , I’ll admit we were at a friends place and I hit him and no he didn’t hit me back . Now he has flipped this whole thing on me that I wronged him while not acknowledging that he peed in my mouth . I am fucking angry and looking for ways to revenge . Suggestions ??