It's the sort of thing where it doesn't matter so much what you decide to do, but what matters is how you make the decision.
If they'd decided that they wanted to stay together and then talked through the different options and then decided to live in Essex, that would be completely different from if Jay now decides to move to Essex after Luke has made an ultimatum of it.
I have had people move for me and I have moved for people, but I would never move for anyone who had made it clear that I wasn't important enough to move for.