My first (and so far only) time cheating [MFF]

When I was in my undergrad I was in a sexless relationship (due to religious reasons for her), lots of kissing and dryhumping but nothing more than that. Out of the blue I got a text from an Ex who was back in town. My GFs family was in town so I arranged to have dinner with my Ex while GF saw her family. We got some takeout and went back to my place. While we were eating on my bed (probably not the best place to eat with an ex), as we’re eating her hand “accidentally” grazes my thigh. I kind of brush it off as if it was nothing and we finish dinner and she heads back to her friends place where she is staying for the weekend.