NTA: Holy shit all these YTA votes is exactly why I can't date in the USA anymore WTF people???

Dude if you consider it cheating and you two "got back together" after I would absolutely classify that as cheating behavior. The only fuck up you made was getting back together with a cheater. What you taught her is that she can break up with you fuck around and you will be right there for her to run back to.

She wants to have a double standard and have no repercussions for her shitty behavior. She is pissed you are telling mutual friends about her shitty behavior. Do yourself a favor and lose this GF. She is just going to cheat over and over again.