I think I call here, but it's close. He could also play 55 or 77 or 2-pair this way.

I also raise a bit more on both the flop and turn. Your goal is to make it easy to get AI on the river, but by the time you get there you have more than pot behind. I raise to $5 on the flop and then to $15 on the turn. If he calls both that leaves you with less than 3/4 pot behind on the river.