as what i have said being sad or emotional wont help you out. i may sound harsh which i apologize but you need to stand up, cheer your fiance up for him to keep on thinking whats the best thing to do.
it doesnt mean that going to the uk means love will be forever. if you both love eachother LOVE WILL FIND A WAY.
he can still visit you in the PI anyway if planning to go to the uk wont click. there are loads of options me love. you just got to accept that sometimes things wont go on the way you want it to happen.