[Simplistic]

betting pattern looks like you have air/draw by checking turn. same thing applies by villain's checkbehind on the turn, with an overpair or TP he bets turn to charge for draw rather than checkbehind. 2h doesnt' help anybody, he puts you on a draw/weak holding because you checked turn and river. this isn't such a standard call, but if you look through the action it makes sense. well played.