What do you do when you are given an ultimatum by your man?

I'm not really sure if this is the right group but please help me. I was sitting down thinking to myself about how me and my fiancé are having a rough time lately. I love him ever so dearly for 2+ years and I know that he is the one for me. This is the problem.... We both still live with our mom's. I am torn trying to choose between staying with my mom and 3 sisters or moving in with him into his mom's place for about 2 weeks. He should have his own place by then.

He told me that his mom is moving to another state and he doesn't want to go with her. I have to stay (as in live) with him(and probably his mom too) for a few days by the end of this month or its over....for good!

By the way.... We're fresh out of high school