Nlcash. How should i play this hand and why?

[Sarahanj]

Interesting standard hand. Have not played much with villain
but no one is superaggressive. He calls a lot from sb and usually bet when checked to on the flop.

100$ stacks
Hero is bb 8 [img]/images/graemlins/heart.gif[/img]
9 [img]/images/graemlins/club.gif[/img]
sb call I check
flop 5 [img]/images/graemlins/club.gif[/img]8 [img]/images/graemlins/diamond.gif[/img]2 [img]/images/graemlins/heart.gif[/img]
i check villain bet 2 i raise to 5 villain calls

pot 12$
turn 4 [img]/images/graemlins/heart.gif[/img]

I bet 10 villain calls
pot 32
river 2 [img]/images/graemlins/diamond.gif[/img]

I check villain bets 20.
What to do?