You have to do what is good for you and not worry about how they will take it. As their reaction is upsetting my try reassuring them that you will still come visit, call, and text. I know distance is thought of different in England but really it is only 3 hours away. We do that as a day trip around here. Besides they should count their blessings you are 26 in a stable relationship and have a career. Oh and you are not moving far far away. Still in the same country and time zone.