I already have a bf but i'm like obsessed with another guy

Well , i have a bf now , i wanted him so bad , and now that i got him , i met that guy, who is not single neither , and i feel like .. i really want him too , i mean.. i want him in my bed nehehe.. but i don't want to dump my actual bf coz i know that if i do it, i will regret it.. u got me ? ughh.. it's hard to explain it i don't want to be a cheater , but i got those.. images in my head , i've got those chills n stuff y know.. I don't know if i'd control myself if i ever got the opportunity to make a move or sth
Anyways , do you know a song that " sounds " a little bit like this ?
Thank you guys
xx

Ummm...Unfaithful by Rihanna?

It sounds like you're pretty much of a ho ... She's A Ho by TOK ?

I can suggest some songs about cheating/wanting to cheat and lusting over someone you cannot have:

Alice Cooper - Poison
Bon Jovi - You Give Love A Bad Name
Core 22 - Sorry
Ruslana - Heart On Fire
Andreas Johnson - The Games We Play
Avantasia - Your Love Is Evil
The Lovecrave - Can You Hear Me?