TerryH

no offense, it sounds she likes you more than you like her,

if she has a  boyfriend and yet you have sex with her. i think it is pretty clearly that she choice you over him.

however, base on you description, it does sounds like you were in for the sex only.

in my opinion, if you guy are actually serious about it.
you should be with her and she should break up with her boyfriend right the way.
i mean, it is the least she can do.
she did cheats on him. she shouldn't keep lying to him!

hopes it help, best of luck, bro