I am really surprised that so many people are advocating a fold here. I would definately call. Villain's stats have him relatively aggressive, and there is no good reason for him to check top pair on the flop, so we can pretty much discount the seven. A x giving him two pair is possible, but again I think he may have bet the flop here. A badly played flopped flush looks the most likely hand that beats you. But I still think the times when he tries to represent the scare card you are pretty certain that he hasn't got give you easily enough to call.