To move or not for boyfriend's job?

Marilyn asks:

My boyfriend has been offered a job hundreds of miles away from where we live now. It is a great opportunity for him, more money and better prospects.

He says it’s a joint decision whether or not we move but I know he’d really like to take this chance. But I love my job here, am doing very well and likely to get a major promotion very soon. I am really unsure what to do.

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