Does a guy like you if he grabs you around the waist from behind?

me and this guy had a past and I ended it with him but are friends still, but we were on a trip and we were on a bus and I stood up in the asle to get something and all of the sudden he grabbed me around the waste from behind and pulled me close to him. what does that mean? flirting?

btw, I realized recently I still like this guy, and we flirt so does that mean his feeling are coming back for me? && he has a girlfriend too. help?
Does a guy like you if he grabs you around the waist from behind?
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