visotech

I went to a party on sat, had lots of fun drank lots, and hung out with this girl like the whole night. Nothing really happend (no kissing, just standing close and her holding my hand as we navigated thru the party), but I think she got clingy....My problem is that I have a gf. For some reason or another I did not mention that I had a gf...so i feel like an asshole. Today that chick im's me and says she can smell my colonge on her jacket...since sunday morning all i can think of is that i was an asshole for not bringing up my gf. My gf is ok with me going out and flirting and kissing other girls if it comes to it. Being excited about this bit, and going to the first party in a long time, i for some reason didn't think about the other girl's feelings. Today she asks me if I have a gf, and I told her I do, and exactly how I feel like an asshole for leading her on. This girl is pretty cool, i would like to be friends with her. How can I repair whats left of the situation? I've always been a nice boy, never really flirted much, this is the first time i've even had a girl upset at me like this...The asshole thing would be to blow her off and never talk to her again, but theres gotta be something better I can do.