I met a guy I'm incredibly attracted to but I don't want to and I'm not going to cheat on my man, please pray for me

Probably going to delete this soon.

Exactly two weeks ago I met this man at my job. For context, we are teachers, and in my country students have to take a final exam (with a written and an oral part) at the end of high school; each class gets assigned an examining committee composed of four teachers, two from their schools and two from another school, to ensure fairness. We came from different schools and met there for the first time. He's a few years older than me (we are in our 30s) and even though we found out we have a lot of friends in common, we had never met before. He's not particularly handsome and he has a bit of a dad bod, but he's hilarious and very sweet.

Well it turns out that spending days shut in a room together (in addition to the oral examinations we are doing now, we split our committee to grade the written papers and so it was just the two of us shut in a classroom for four days) is very dangerous, especially if you have absolutely no intention of cheating on your 10+ years man whom you love very much, with whom you have a 1.5 year old son, and with whom you plan on spending the rest of your life.

In over a decade, I had never found myself so viscerally attracted to another man, so this is my first time navigating this torment. Thankfully the exams will be over in less than a week so I will have to keep my dirty thoughts to myself only for a short while longer. I don't think I am doing anything to encourage this explicitly, even though I realise he is flirting a lot and I admit I'm laughing like a teenager at his silly jokes. I think the other two teachers (two 40/50 yo women) suspect there might be something going on between us, judging by the furtive looks in our direction, so I suppose we must have been acting like idiots.

Please share encouragement and help me survive the guilty feeling. I despise cheating and I know for a fact I won't actually do anything with this man, so please don't suggest it. I also know it's relatively normal to feel occasionally attracted to other people when you're in a relationship (as long as you don't act on it of course), but it's still so bloody hard to accept I won't ever be fucking this guy. I have been fantasizing about him eating me out on one of the spare desks for a week, please send help and tell me it's going to pass soon