king high flush...too passive?

[technologic]

3/6 NL party full ring

villain 31/13 over only two orbits or so, opens to 20 in the UTG+2. i call with KJh in the bb.

flop 6h 8h 2h
hero checks, villain checks.

turn 3d
hero bets 35, villain raises to 125, hero calls.

river 5d
hero checks...

i think i played bad on pretty much every street.