Most Helpful Girl
First, be honest. If you lie about why you're breaking up with her not only can she feel betrayed (if she finds out) and you will feel guilty. Just tell her something like "I still love you, but I can't be with you anymore because of your mother. Maybe one day but not right now"
Most Helpful Guy
Dont break up, you love her, she loves you, stay! true love really doesn't come around that often. Once you finish your college and make something of your life, perhaps your mother in law will see eye to eye with you. I spent almost 10 years with my ex girlfriend and i never even met her mother because she didn't like me dating her, how do you think i felt! That said, i pretty much said screw her and kept dating her anyway. We both moved out together and although sadly the relationship ended (for various other reasons), I dont think i could of lived with myself knowing that I gave up true love for someone else' piece of mind. I'd probably talk to her mum and try to see her point of view, maybe better understand her (perhaps her husband ruined her life and she doesn't want you to do the same to her daughter? who knows)...