[darkinnocenteyes]

Sometimes good people cheat in a momentary lapse of judgement...
Sometimes people cheat because they feel as if thay aren't getting what they need from their romantic partner, whether it be emotional or physical...
There are a lot of reasons why people make the decision to be unfaithful.
My advice is talk to your girl. Communication is key. Analize how you feel about your girlfriend. Pinpoint why you cheated on her. If you love her and want to continue on with your relationship with her.... you should definately not let this go without talking to her about it. If she knows what you did, she could be very hurt. If it was a one time thing and you made a mistake... then tell her about it. Be completely honest. Apologize. Hold her if she's upset. Taking responsibility for your actions and showing honesty to her will be way better for your relationship in the long run than if you keep it quiet and just forget about it. I know it's hard to admit when you've done something to hurt her, but if she loves you and you show her that you're sorry, then you two should be okay.