The side chick

I don't want to get bashed for being the "side bitch" but I need advice, I met this guy at work and everything was perfect he was funny we hung out a lot and when he asked what I thought about relationships I said I didn't have time for one. I guess I blew him off.. Well we sorta became fwb and I recently found out he has an on and off going relationship.. I think I love this guy and idk what to do 😔 (keep in mind our fwb thing has been going on for about 2 yrs)