My DP was made redundant and there isn't a lot in his field where we live. He's been told of a fantastic role which is effectively his if he wants it - at the other end of the country and I am dreading him saying he wants to take it.
Neither of us wants to move to what is a much more expensive part of the UK and because I was the main breadwinner by quite a margin, I can easily support us where we are now, albeit less comfortably than if we were both earning. His salary would equal mine if we moved but would be almost entirely swallowed by increased living & transport costs.
Having said that, this move would be a great career move for him. I could readily transfer to an office about an hour and a half from where he would be working, but one or both of us (probably me) would have a serious commute that wouldn't be sustainable long term 
My inclination is to ask him to super-commute for a bit if he does want to take the role & to keep trying to get something locally in the interim (it wouldn't be immediate start), but I don't know if I'm being prudent or less-than-supportive because I really don't want to move
Other consideration is he loves his job, whereas I just love my paycheque 