fucked a girl about 2 years ago, we started hanging out... I have feelings, I also have a boyfriend

 A little back story, the girl and I (we will call her missy) so, missy and I have never dated. We've held hands kissed in public and fucked on and off for as long as I can remember but we've never been exclusive. The last time we fucked I distinctly remember her taste, the way she felt, the way she flicked her tongue and how great it was. I remember every detail. Well, we started drifting apart once I got a new boyfriend. But, recently weve been hanging out a lot more. Going to shows, she's coming to my house, etc... and of course we don't do anything sexual but I can just tell she wants to just spread me open and lick me until I cum. She has this look she gives me. And I want her so bad, I can't stop thinking about the sex and her in general. It's not love, mor like lust. I feel bad for lusting after her though because I have my boyfriend but I just can't help it, I get wet just by thinking about her. Anyone else been in a situation like this? What do I do?