She asked me to do a shot with her at bar for no particular reason?

we do know each other but we weren't hanging out , we hadn't even talked last night until she asked. i had been sitting at the bar by myself and she was with some friends.

she just like randomly asked and i came over and we did the shot together.

but its weird i had seen her at the gym about a week ago and she didn't even say hi or anything , she also has a boyfriend and know that he wouldn't of been ok with this as one time last summer he followed me around the bar and came up to my table to harass me cause i had talked to her the night before , he's a real douche

we have talked at the pub before but never did shots , i did do a shot with one of her close girlfriend's last year so maybe thats where she got the idea? if she knew i was willing to do drinks with her friend than i'd be ok with doing one with her? or she was jealous i did drinks with the friend and wanted to see if i'd do one with her?
She asked me to do a shot with her at bar for no particular reason?
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