I am being emotionally abused. I just realized this recently what can I do?

I am very much alone in the world, and have only him close to me. He has kept me waiting for 11 years with false promises, manipulation, and hope for a future together. I don't know how to change things. I want to 'disappear', but I can't move away, he knows where I work, and I feel very much weakened by his presence. I read about the 'bait and switch' manipulation and it totally fits this situation. Is there any advice when I have nowhere else to turn?