I'm dating a guy, but i've met another one. What to do?

I'm having a huge problem right now. I have been dating this guy for a year and a half. But i went clubbing with the girls Saturday night and i met this guy there. I got to talking to him and we just seemed to click. He even hugged me goodnight and it felt so amazing being in his arms! I like him a lot and i don't know why. Because i've met lots of random guys in places before but never felt this way about one i just met. We're friends on facebook now and so we still talk here and there. I like him a lot, but i have a boyfriend. My boyfriend does treat me well for the most part and i do love him. For some reason i'm just craving to see this guy again. Why is this happening to me and why do i feel this way? I know how i'm feeling is wrong and it's driving me crazy!!