This article was taken partly from http://www.chastity.com
If you really want to change your parents’ opinion of this guy, then you have to do the one thing you dislike the most. Obey them. You see, if you really hope that this relationship will last, realize that the more you defy or deceive your parents, the more resentment you will create. How is your boyfriend supposed to win their respect while openly going against their will?
What you have to do is to quit trying to convince them how great he is. If he is a gentleman of character, purity, faithfulness and honesty, then these qualities will become obvious to your parents. Instead of playing tug-of-war with your mom and dad, try to see why they don’t like him. Maybe you know exactly why they disapprove of him, but you have just gotten over it, you don’t see it as a problem, you think he’ll change, or you want to improve him.
if it is God’s will for you two to be together, His plan for you will not be ruined by you honoring your parents. God honors those who honor him. So be at peace and know that while rejoicing in the truth, love bears all things, believes all things, hopes all things, and endures all things.
Let there be no doubt that God honors those who honor him, and that he always gives his best to those who leave the choice with him.