19m taken tempted by ftm on sniffies

I'm posting this here because I really need to get it off my chest. I (19m) had a FWB relationship with a FTM bear daddy (35m) on Sniffies. Obviously just hookups nothing else. Anyways, I got into a relationship a few months ago and cut everything off ofc. Things have been going great, but I can't stop thinking about this guy and how great the sex was, how wet and tight that man pussy was. Best part is, he had a hysterectomy and we were exclusive fwbs so I could go raw. It felt amazing.

I finally caved and checked on Sniffies today, just to see that he was online. I didn't text anything but oh man... I was definitely tempted to. I don't think I can or will ever cheat on my loving boyfriend, even writing this is making me feel guilty. What should I do? (messages open)