<human>: Can you succinctly summarize the text in 1-3 sentences?

Last Sunday, I broke up with my (now ex) boyfriend of 6 and a half months because I had drunken mistake sex with a "good friend" [m18] of mine the night before. 

Before we were about to get back together, I decided that I should tell him because he has the right to know if I had sex with someone else. Plus, it's better hearing it from me than from someone else.

The way he decided to resolve this situation is by him having sex with this really disgusting girl . She's seriously, well -in nice terms- a hideous butterface. 

Now, I know what you're thinking. Why would he do that? Why would you be okay with that? 

As for being okay with it- I'm definitely not. Though, I don't have much room to talk; I did start this whole deal. I guess getting even is his way of resolving a problem.

When I told him about what happened between me and that "good friend", I apologised and begged for forgiveness, knowing I probably wouldn't get it from him because he's extremely stubborn.

What should I do about it? Tell him how I feel about this situation? Please help me out on this one, guys. :/
<bot>: Had mistake sex/cheated on boyfriend, broke up with him, we want to get back together, so I told him about the cheating and now he wants to "cheat" on me to get even.