I'm cheating on my girlfriend and she's cheating back on me
Why are you both cheating on each other? Two wrongs don't make a right.
I don't want to talk anymore, we've tortured each other enough
Cheating around is never the answer, and since both of you are doing this it's just a nasty thing and both of you just need to break up. Your relationship is super toxic and just needs to end.
Don't tell us what to do.
Fair enough, but I am just trying to give you sound advice. I have a lot of friends in your predicament and I know how it always ends up, so I want to make sure you don't go down the same path.