[tewall]

He's pretty much betting the pot, so you should call if you think it's better than a 1 in 3 chance that he is bluffing. If you think it's less, fold. If you don't know, flip a coin.

Aside from your decision on the turn, your call on the flop doesn't make sense unless you already suspect he's bluffing. When you called the flop, given your description of him, you must have expected him to bet again on the turn. So if you're going to call the flop, call the turn. Otherwise fold on the flop.