Overpair, Is villain slowplaying a monster?

[Double_Nothing]

Everybody's got a full buyin.
SB 0,10
BB 0,25
Seat 1: fold
Seat 2: fold
CO: Villain, TAG(17/11/3), limped 0,25
ButToN: HERO, sLAG (27/25/3.5) [Js Jc], raises $1,10
SB: fold
BB: fold
CO: called

Flop [4s5h5h]

Villain checked
Hero bets 2,20
Villian called

Turn [8c]

Villain Checked
Hero bets 3,75
Villian called

River [10s]

Villian bet $10
Hero? [img]/images/graemlins/mad.gif[/img]