with such a passive line from villian im very confident we are ahead and bet out 1/3-1/5 pot on the river..

such a line says weak made hand who just wanted to get to the showdown, or draw. with a second call on the turn i really dont want to see a flush draw complete on the river (a lot of people in micro stakes love suited cards).

i would think twice if he suddenly bet out on the river and would really think as to whether or not to call based on the odds villian gives us.

However with another check you should bet out for value with a lot of confidence.