Give yourself an out. Move to be with him, fine, but make sure it's someplace you actually want to be stuck if the two of you split up, and make sure you have a job, a place to live, etc. and aren't in trouble if he says "we're ending it, now move out." And always have a backup if that falls through.
I learned this the hard way; I made huge plans to move in with my partner of almost four years, planned all of my future around living in that town...and then we split up before I got a job and moved there, and I had to abandon everything and start over in my hometown, where the opportunities were far less. I don't recommend it! And there's no way I'd ever again even think about moving for a guy unless it were somewhere I already wanted to move and I were going to be living on my own so if the relationship went splitsville, I'd still be okay.