Charlies Asks:

My name is Charlie and i have this problem. See i have been dating this girl for nearly three years and every thing has been great i thought she was the one i could spend forever with. Until about three months ago we were at this dance and as we were leaving there was this girl who i happened to notice was looking at me and of course I looked back and she kind of smiled. Well my problem is i cant get her out of my head even though i know i would never have a chance at her and i do love my girlfriend but i dont know if i should try to get in touch with her or not so what should i do?