My Dear, I know its difficult but learn to let go. Okay ? That guy likes the side attention he gets from you and sometimes they find refuge in girls like us. We are close friends, not part timer. So its like when he wanna call, he call la. Don't you feel degraded? As a girl you have to have your dignity and stand up for yourself. Don't let this kinda guys push you around. Not worth it la.  And as you said, he calls you when he's free or at the office? What does that show? He is calling you and not his girlfriend. He is just killing some spare time and that excludes his own girlfriend. He wants you to love him but he is reluctant to be with you? Come on. Please tell me you are better than that. Understand that he is just treating you as a part timer.