i know this ain’t yahoo answers or reddit but…

So I am a SigmaNu and my girlfriend is an Axo and I’m fine with her, but there’s this other girl who I’m so turned on by. She goes to this school but she’s not in Greek. She, my gf, and I all went to the same high school and are from the same hometown. I really care about my girlfriend but this other girl is so breathtakingly gorgeous. Back in high school I was attracted to her but she graduated a year before me (and my gf) so I stopped seeing her and nothing ever happened between us bc I was dating a different girl at the time. But anyways what do I do? I really wanna sleep with this other girl and now that I have started seeing her again i cannot stop thinking about her. I want to stay with my girlfriend but I don’t want to give up this other girl either. This is all just physical attraction of course bc she’s kind of a thottie anyways but I don’t wanna hold my temptations back. I mean she has a good personality tho HELP