Hi rainwater,
Seems you're facing some very tough circumstances and decisions, ones that would no doubt inspire consternation, frustration, and sadness in anyone. Whatever you decide, whether to move with your fiance or remain closer to your daughter, try to resolve your feelings and make peace with that decision before you embark on your new life. Although I can understand your anger and annoyance at your fiance taking the new job so far away, I wonder what may have motivated him if he really did not need this position, as you stated. Also, I wonder if there is any consolation in the fact that your daughter, though still young, is an adult, should you go ahead and make the move. I guess that wouldn't matter as much, as no matter how old they get, your kids are still your kids...
Anyway, all the best to you, and I hope you find happiness wherever and however you start anew.