50NL, SH. villain is bizarre player, bad - which makes it hard to put him on a hand. my image is tight - not sure if he is paying attention to that...

BB with 65c. one limper. i have about $50, villain has me covered.

$3 pot. flop 569 rainbow. SB bets $3. I raise to $8. he calls.

pot $19. turn 8 still rainbow. he bets 5. i made it 10. (i almost never min-bet/raise, dunno why i did that here)

pot $39. river 2. he instabets $20. and now what? my gut is telling me he is full of crap, and i almost insta-called. then i went into the think tank...

looking back i shouldve raised more on the flop [$12] and turn [$20?]. acutally, i played this one horribly throughout...

but as played what do u do on the river here?