first off if she knew it bothered u then she would'nt hang around with him if she cared for u. and of course he is tryin to get in her pants and she knows this girls always knows when a guy starts sniffin around how does she act when u ask her about him i good plan is to tell her since he's her friend say lets take him out with us sumtime and see what she says if somethings going on she would try not to do it and if so take him out with u and see how they act together.and most of the time girls like to have options to fall back on so thats what i'd suggest u do u need to see them together for a period of time and im betting she'll not want to do it as im sure he flirts with her all day at work