Seems to me you'll have three options: long distance relationship (which I do not recommend), taking him with you (I don't recommend uprooting him unless you're practically on the verge of getting married), or one of you driving four hours at least once a week to see each other (which I also don't recommend). So, in short, I don't recommend it. You'd be better off waiting until after you've moved.
On a side note, this exact thing happened to me. I met a girl who I get the feeling would have dated me, but then I got what I thought was the ultimate job offer in another state so we broke things off and I moved there. I ended up moving back again a few months later, but when I tried to reinitiate contact with her she wouldn't even answer my texts.
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