How do I tell my mother I'm moving in with someone who lives very far away?

I have lived away from home on several occasions in the past. I recently moved back home to help my parents and so that I could get back on my feet. At this point I’ve been back home for about a year and a half. I’m 28 years old. My parents are very kind and they are not generally unreasonable about most things.

The problem is that I’ve been dating a guy who lives fairly far away for several months now. He’s only been to visit once because of scheduling issues that we both have. He wants me to move up there and live with him, about 1000 miles away from where I live now. Whether or not this is a good decision is not really the point since I’ve already decided that I want to do this.

The problem is that while my mother is kind and caring, she is also very opinionated about many things and I have a feeling she is going to try to forbid me from doing this. How do I tell her that I’m moving without implying that I’m asking permission, but keeping our relationship intact? Is there really a good way to do this? Or is the best thing just to tell her that I’ve already made up my mind and that I’d like her blessing if nothing else?