How did his father build such a viable construction business (that even cold, dreary, wet Ohio winters won't slow down)? Can't his father just coach him in starting his own construction business in SC? Surely, the weather in SC is more amenable to the construction trade than OH for more months of the year.
Personally, I don't like dayton either and wouldn't want to move there but...when you first met, what was the understanding about where you would settle down?
It seems to me that your (singular) life is on course. You're working toward your degree, working parttime and using your parents' car. But it's his life that is stalled. Why are you the one expected to uproot yourself? It seems like a mistake to mess up the part that is working.
3b (with 3c tendencies) on modified CG