Rainwater,
The worst thing that can happen if you move with your fiance, is that you might realise that it was not the correct choice for you. If so, you can make the decision to move back to your daughter and home based on the fact that you gave it a try moving with your fiance, and it did not work for you.
Just as your fiance has the right to make decisions for himself, so do you. Listen to your instincts, not your emotions or logic in this case. Look within for the answers. At the end of the day, we can always correct mistakes that we make. Whatever your choice, it is always the right one, even if the outcomes are horrible. Everything happens for a reason and all is as it should be.
Take good care of your precious self......and try a bit of softness on self
Michah