I'm cheating on my boyfriend, real...

I am dating my bf from Washington I am now moved to Las Vegas. After four months I was offered sex i said yes. I keep saying yes because I know my body wants it but I still love my boyfriend. I don't know yes I'm a terrible person but I did want an open relationship while we were apart. Idk.

Edit. Yes he knew I wanted an open relationship but he didn't I was fine with that for a while. Yea I'm pretty sure I'm poly. I know I need to end something. I will end the cheating I know that I should probably tell him and I deserve what he does after. I'm pretty young and have messed up so many times now.

Edit2.i ending the cheating. But I can't tell him I cheated.