Offered job overseas-Need help with decision.Your thoughts? Thanks!?

I'm a 47 yr old single woman in a serious relationship with a great guy.I've 2 grandkids (another on the way), 2 daughters & all my other family living w/in 10 miles.I've been offered a "dream job" overseas for 3 yrs that would include lots of travel,guaranteed my current job back when I return,all housing expenses pd for,extra $ for cost of living, &be in a beautiful area of the world to work & live in.The problem is leaving my partner & my family.I've felt something was missing that I needed to do for a long time & even though I've more than most in my life,I feel real antsy and seem to keep constantly looking for something.If I went, it would be my first time alone.By going I'm not sure I would lose more than I would gain or if it would make me stronger & be something good.My boyfriend can't go now & he has asked me to stay & build a life here but alsoencourages me to go if I feel its right.You can't get back time away from loves ones,yet I'm not sure if this is what I need for me.