What might his range be to call 4bb pre flop. Maybe Good ace AK,AQ, AJ. A number of pairs looking to hit a set and not a lot else besides perhaps some big suited connectors.
By the river how much of this can you beat ? the pairs will only be betting if they made a set. AK made a straight probably the only hand that is in my range, goes with the betting and you beat is AQhearts. I would fold