I found that my girlfriend was cheating on me towards the end of our relationship. We split up, and got back together. She was holding grudges and being verbally and emotionally abusive before the break up, and as calm as I tried to be I exploded and we broke up. We got back together and I found out she cheated, and she has the audacity to argue with me about what I did towards the end... And all I did was try to get her to understand my side and vent a little, and it was never good enough. Why would a cheater think they have the credibility to argue?