Responses, please?

For almost nine years I've been in love with the guy I'm now dating. I've watched him go through a lot. Finally, Almost a year ago, after waiting for what seemed like forever...I told him how I felt about him. We have been inseparable from that moment forward. I love him and I know he loves me. It's almost been a year that we've been dating. We are talking about getting married. He has asked me to move in with him. I'm really excited about that except...I'm worried as well. My family is very strong in their religious faith and they are against it. They are against our relationship because they know we have premarital sex. I don't want to lose my family....but I love this man more than anything in the world. I know this may seem like a stupid post but I really hate feeling like I have to choose between my family and the love of my life. How could I handle this? My mother seems to hate him for no reason and has basically gave me an ultimatum. It's either him or my family. Am I selfish for wanting to choose him? It's all complicated. I hope to receive some positive feedback. Maybe even some responses from people who have been in similar situations. Thank you!