I was dating a girl who i knew for a fact that she with somebody else but i gave her the benegit of the doubt when she told me she was single then, one day we were having lunch and she went to bathroom and left her phone with me, and her otger boyfriend rexted her and called here that's when i decided to cheat as well, and when i told her i was cheating she took it personally and got angry and told me she was cheating too