Serious problems with my boyfriends mother. Help?

This is a problem, and a major one if you plan on ever getting married to her son. It could just be the whole thing of one female starts to get defensive with another in the house. She might feel you are taking her job. In fact that is almost exactly what it sounds like, I know this from experience from an ex roommate. She thought I was moving in on her territory ( her fiancee and her cleaning the house) so she did everything she could to get her fiancee to kick me and my (at the time) two year old out. Give it time after moving out, if things do not get better after a year or two look into going to a family counselor with her.