Playing in a 1-2 game in Bosnia where I get in a hand 3 ways. Villain has me down as loose aggressive (in a previous session having 4bet shoved bottom pair against him believving he'd fold an overpair to an 8 high board, he happened to have flopped middle set and i showed my cards at showdown so he had to show his set) - I obviously have him down as a pretty-very tight especially post flop. Have also seen him make pre flop re raises thinking this must be a steal - it's too big to be genuine hand and he's turned over KK a couple of these times, so have not once seen him bluff in 3 poker cash sessions (as in seen his cards when/if he's been bluffing) He's also probably the only (other) competent player at the table - the rest are whales.
I have a stack of €270 he has me covered.
I straddle to 4, Villain UTG+1 makes it 11, Whale calls UTG +2 rest fold I make it up with

Flop -

- checks round
Turn -

- I lead for €16 with a gutshot and flushdraw figuring i take it down most of the time and also build a pot to hit/steal if i do get called. Villain calls - pretty quicky. Whale folds.
River -

- I lead for €31 expecting to get called by AQ/KQ and take the pot down. Villain goes into his stack and raises to €101. This is the absolute last thing I expected to happen in this hand...
Thoughts?