Do you think you could just be friends with someone you have feelings for? WWYD?

Some background info:

So I don’t have any gay friends or friends in general like that frfr. It’s this guy at my new job that I thought was cute and I had a little crush on him. He introduced himself to me and we just had small talk at work throughout the day. I couldn’t really tell if he was straight or not. Couple days later I’m on Jack’d and we traded pics and it was him. So we actually start messaging each other and we exchanged phone numbers. We talk about a lot of different things but also send sexual messages. It’s been about 2 months of getting to know each other and stuff. I actually do like him but here’s the thing…. He’s in a relationship already. Him and his bf have been together for 13 years (not an open relationship) That really crushed me not gonna lie 😕. Thing is we still talk sexually though, I feel like we’ll never actually do anything but still I know it’s not right.

I know it’s really really messed up for me to even keep texting him like that but I have backed off of the sexual antics. My questions are, I wonder could we just be good friends even though I’ve kinda fell for him? Am I disrespecting their relationship by continuing to talk to him knowing my true feelings? Like I don’t wanna just cut him off, since we do work together.