@OP: You sir, are a fucking douche, and should die in a pit of fire - to cheat on your girlfriend is so low I hope you die. Hoenstly, it's fucking immature and wrong to lead her on like that - she could have wanted a serious relationship and stay with you - she probably trusted you so much and you go and break that trust by going out with another girl? You disgust me.
Fucking die.
(PS: Everyone in this thread fails at life for their use of English)