Should I move out if I'll lose my Mom for good?

So heres my situation. Me and my mother dont get along at all. We never have and probably never will. She goes through these periods where we’ll get along for a couple a weeks, then she acts as if I dont excist the next couple. during these periods she tends to say extremely hurtful things to me always bashing my character. I go through depression quite often because of this and I’m at the breaking point. My mother has always told me that if it wasn’t for my father I would’ve been out the house along time ago. I never did because I had nowhere to go, but now I do. I’m really considering moving in with my boyfriend this summer who has his own place through the military a couple states over. I know if I do this finatially I would be stable and would still be able to continue on with college, but I do take a huge chance of loosing my mother for good, and despite of how she treats me I love her to death. I really dont know what to do. My mother strongly believes that you dont move in with a man until you marry him. Me and my boyfriend do plan on getting married but not for a couple more years.