[Shillx]

You are good way too often to check/fold. If I had to guess a hand I would say JT followed by some other similar hands (some of which you have beat). Of course he could have T9 or something but pot odds dictate a call imo. The ace is probably a poor bluffing card but most people don't really understand the dynamics of when to bluff and tend to do so at the wrong times. Pretty easy check and call imo.