Help me sort my thoughts out please!!

Hey guys, so I know I will receive insane judgement, criticism and slack for this post but I just need some very honest advice...

I am currently in a 6 year relationship with the most absolutely sweetest, respectful, loving man I have ever been with. He keeps me calm, sane and has helped me grow mentally in tremendous ways. We have been in a long distance relationship that will be hopefully ending next year. My family loves him, and his loves me. We are literally two peas in a pod.

Heres the thing, before i met my current boyfriend, i was attracted to this other guy and we were kind of talking for a while but never pursued each other. However recently i went out with my friends and that guy happened to be there and the chemistry was unreal. We have a lot of sexual tension. We held hands for a second or two but then i pulled away. I love my boyfriend, i don't want to lose him but i also cannot stop thinking about what could have been with the other guy. I feel like i'll bump into him again at another gathering.. he's just so hot and again, theres so much tension. Ladies please help. Slap me silly, anything. How do i stop fantasizing or thinking about what I shouldn't be