so all of a sudden we start gettting in to arguments when were drunk. she gets mad and goes to this kids room with her lady friends. long story short, they left and i saw them kissing. but i snooping around out side, and i saw it through a window. i feel like a sleeze ball for not trusting her, but now i know that actully happend. i was heartbroken when i saw this. i dunno how to go about talking to her. i cant tell her i was outside the window. is this grounds for breaking up please help!!!