caught on the side

so i was recently separated from my ex and feeling all sorts of things you know? one day this guy at the art studio sees my work and we start talking, just casual stuff. before long it turns out hes got a wife but he's into me too...i guess? anyway next thing i know were hanging out and one night it happens, no big deal or anything. after that though it felt like maybe more than i wanted to admit even if i shouldn't feel bad about his cheating right? we both knew what the other was going through. ended up seeing each other a few times over the next month but then he gets cold feet and calls it off. now im back to square one, wondering what all of this really means or if its just some kind of passing fancy...