The OP mentioned earlier that she has a medical condition which needs "looking after" and she doesn't have many friends where she is, nor does she trust many people to help with the medications. She knows she can count on him in this regard, so she feels he is her best option.
However, I would say, maybe now is the time to take a chance and risk stepping out of a narrow world to befriend others and make more connections that will be nurturing. Because the pros of this relationship do not really outweigh the cons.
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein