<human>: I met a girl, lets call her Kelly, on Tinder a couple weeks ago. Things went well, we went on several dates and got along pretty well. This was a pretty casual relationship with no talk of exclusivity or anything as well.

A week ago I met another girl (Anne) from one of my classes that I had a crush on for a whole year. We hit it off and end up going on a couple dates. The problem starts here, I invited Kelly to a party earlier in the week and I'm unsure of what to do and end up taking Kelly and we sleep together that night. The next morning I feel incredibly guilty and end up ending things with Kelly because things are getting out of hand. This is my first time dating casually also. 

Now Anne doesn't know about my earlier relationship, and I'm feeling incredibly guilty for having been with someone during our first 2 dates. We haven't slept together or had a talk about expectations, but I don't know if I should tell her or what but the guilt is wracking my brain. I apologize for grammar, I didn't sleep super well.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Casually dating one girl for 2 weeks, leads to sex, realize I like the new girl more and end things with the other girl and guilt ensues.