If she shows interest ,or complains about her boyfriend to you.
Try asking her.
the smartest thing to do is ask.
Find another boyfriend that's cuter than he is
Find who she is and find out how she realy feels about him.
SLAP HIM
Find a way to impress her.
find another girlfriend
It would be a wise decision not to "hit on" her at all since she already has a boyfriend. A better choice would be to find a girl who does not have a boyfriend and ask her out on a date.
just find a girl that u like and if she has no boyfriend, ask her out
obviously that person is going to deny having a fling with your boyfriend
Get your friends to ask her without using your name.