No legal advice needed, just moral judgement please.

Accepted a job offer in one country, great pay, but very isolated and small community, about 4 months ago. I have also led these guys along the past couple of months by getting together immigration paperwork. They have been expected me for a while.

Recently had a unexpected possibility of a job offer in another country, greater pay, not as good work life balance, in a big city I have dreamed of living in.

If offered the latter, AITA for taking it? 