Emotional, feelings. To me , he texts.

I have been talking to a guy since 1 yr . we met on facebook exchanged numbers since i already knew him . he is senior to me , pursuing his ms from abroad. we wxchanged numbers and have ben talking over phone , watsapp, skype. we met also when he came to India. he introduced me to his friend as well. we became so close that we madeout once. later i came to know he was alreday having a girlfriend and was using me just as a tympass but never confronted him. after few months our long hours chat almost ended. he 1ce said i was a his girlfrnd only whom he hasnt proposed yet. Now whenever he talks , his way of talking is entirely related to sex . whenever he feel lyk talking to me , he texts .. and as a hypnotised person replies inspite of knowing that he is clearly cheating on me . wht shud i do , shud i confrnt him or stop talking to him , which is really difficult for me .