So, I accidentally went on a date. But I'm taken? What now?

BouncingPig
So I met a girl at the local guitar shop. Turns out we both have the same photo class and i got her number, and we went to "hangout". What was supposed to be a day taking pictures for my photography class turned into dinner and a movie. So I was totally cool with it just being a friend thing (Did think she was really into me anyways) While we were watching the movie she cuddled up next to me. She kept looking at me and feeling all over me. As a faithful dude I resisted her, while I must admit she is waaaaaay cuter than my current girl. We did a couple random things as well. I taught her how to pump gas, throw a football, and play a couple chords on the guitar. After the movie I took her home, we did end up kissing. And she introduced me to her parents. I really liked that she's younger than me. (Only by a year) But she kinda digs the whole me being and older guy & college football player. And I got to like show her things which was really fun and fresh. While my current girlfriend is 4 years older than me. I must add, while I call her my girlfriend we've never made it official. But we've been "together" for about 2 years. What should I do?
So, I accidentally went on a date. But I'm taken? What now?
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