River minraises

[vanHelsing]

Villain is 27/7, postflop he is more on the passive side and so far really unimaginative.

Party Poker No-Limit Hold'em, $ Hero (6 max, 6 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

Hero ($318.45)
UTG ($641.77)
MP ($243.60)
CO ($302.75)
Button ($126.55)
SB ($92)

Preflop: Hero is BB with 5[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $1.
UTG calls $2, MP calls $2, CO calls $2, <font color="#666666">1 fold</font>, SB (poster) completes, Hero checks.

Flop: ($10) J[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets $7</font>, UTG folds, MP calls $7, CO folds, SB folds.

Turn: ($24) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $16</font>, MP calls $16.

River: ($56) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $25</font>, <font color="#CC3333">MP raises to $50</font>, Hero folds.

Final Pot: $131

Do I have to make the crying call here, having my read?
I sometimes bluff tight/thinking players successfully with minraises in simmilar river situations.