<human>: Could you distill the essence of the text into 1-3 sentences?

Back around November-December I started going out with this girl K from my CS class at school. Beautiful girl, kind, and there was strong chemistry between us. I went back to Oregon for winter break for a few weeks and the spark kind of died down. We both had family stuff to deal with and we took a break from seeing each other for a while to deal with our own shit.

During that break I started hooking up with this girl, Z, who always wanted to fuck me. She's attractive and cool, but I never had any intentions of having a serious relationship with her. We've had sex probably 10 times and she's really into me, to the point of her going out of her way to tell people we were hooking up. This kind of annoyed me, as I don't like the details of my personal life to be discussed much. 

This girl is probably in love or super into me, but I don't like her back nearly as much. I haven't hooked up with her for almost two weeks, and since then I started going out with K again. I really like K and she really likes me back, but I don't know what to tell Z. It was hard for me to draw the distinction as her just being my friend with benefits. She clearly likes me more than being a friend with benefits but I'm no longer interested in having sex with her. It might sound arrogant of me to assume this girl is super into me but she is just really attached and insecure about our situation.
<bot>: Was dating this girl I really liked, we took a break, started hooking up with another girl. I'm dating first girl again, don't know how to cut things off with my fwb.