Advice need.

I'm in a really odd situation. I recently moved in with my ex girlfriend. I have my own space and everything. I keep getting into arguments with my current girlfriend about my situation even though she knew about the living situation before us being in a relationship (my current lives in another state). I'm so tired of having the same argument over and over. I don't want my ex but my currents issue is she thinks my ex wants me. I really don't care if my ex wants me or not I'm just trying to get my life together. What should I do?