We all have our principles and have made great decisions in our lives. Some people compromise that because of certain people in their lives . This is an ERROR!! Maybe you have made a decision not to have sex with anyone till you are married but you later fall in love with this charming guy that loves you but does not share your principle about sex. And in order not to make him feel bad, you agree to have sex with him. That is so wrong. If he threatens to break up with you, leave him. Don't get me wrong, he might be a good guy but if he doesn't agree with your principles, it's not worth compromising. I know it might be hard and you might be scared of not finding someone that will love you later, but just leave. There's something called 'PRAYER' and there is a God to answer. Tell Him what you want and he will grant your request no matter the time. There are other things you can compromise in order to strengthen your relationship. I'm not dealing on that in this writeup (maybe some other day).
Just be firm in your core principles and anyone who doesn't agree with you is not worth being with you.