Maybe your girlfriend is mature enough, self respecting enough to over-ride her physical desires to complete her schooling and follow the religious beliefs you are BOTH suppose to honor; even if you are not.

Maybe she smart enough to check on line and knows you are advertising for hook ups on the side and are a cheater on an international level.

Maybe she doesn't want to risk having diseases. Which could stop either of you having children. Or worse. Hopefully she can have you checked medically before she actually marries you. I would not trust you any further than I could pick you up and throw you. Cheating on a four year relationship. SHAME ON YOU!!!!!!!

Or hopes your weak personality and student status will keep you from being chosen for a sexual romp. Or graduation. Or real employment which maybe her parents are holding out for. OR a more suitable suitor.

Or maybe she is already humiliated and hopes that by continuing to refuse you that you will just GO AWAY. I am quite sure if she sees this that thought will cross her mind. If you don't just break her heart.

Sadly it sounds like you have some kind of family endorsement if you have claim to being her boyfriend for four years. If I was her Mother and found out what you are trying on the sly I would forbid my daughter to marry you. And cane you myself!!! But perhaps the double standard applies and they are just hoping their daughter will escape your convincing until marriage.

My sympathy and prayers go to the girlfriend that she finds better boyfriend material.