I play in a rock band..Guitar/Sing..And my band was doing a local show (Detroit).... My girlfriend was in the audience in the front and we were to maybe our 5th song when i loked down at the audience to see her Kissing some guy.. I immediatley had a sinking feeling and played very badly for the rest of the show...i didnt even want to play i jsut wanted to jump down there and break it up...my question is should i dump her i cant make up my mind i am only 18 and i think i lvoe her..would it be unreasonable of me to dump her for making a mistake am i over reacting? I dont know what to do.. please help?