There is a new female coworker that i find very attractive , she is very outgoing and easy to talk to , we had a few interactions that i count as flirting , we were walking to the break room and i bumped into her by accident and she told me smiling " are you trying to dominate me ? " , we were playfighting and she let me rest my forearm on her thigh for a couple of seconds , we were in the gym , she was sitting on the chair and i was on the floor next to her and she was shaking her leg , i grabbed her by the ankle and asked her if she has to much energy , she smiled and started shaking her leg faster , i was looking at a register from our office and i told her to come look at it to check something and she pressed her chest to my arm very close , i caught her looking at my arms multiple times , an app wasnt working on her phone and i tried to fix it and while i was looking at the phone she put both her hands on my upper leg , she told me sorry if it bothers you if i sit like this and i told her dont worry about it
The thing is that she is engaged ( boyfriend of 5 years ) but from what i understand things are not going very good between them , she complained that he started smoking and quit the gym , she wants to workout but she doesnt like going without him
She kinda flirts with other guys at work too , she playfights with them , she was walking in from of some dude and she was stopping sudden to make him bump into her , some guys grab her by the muscles between the neck and shoulders ( i dont know how they are called , i think traps )
Should i do something or just treat it as friendly behaviour ? we are both 23