QTs bluffing in a 3bet pot

5/5

~$750 effective

BB - Unknown player. I haven't been paying attention to him, but I haven't seen anything stupid from him either.

Hero(MP) Q♠T♠ opens to $20, BB 3bets to $80, Hero calls

Flop($165) J♣ 7♥ 6♣

x x

Turn($165) 4♠

BB checks, Hero bets $90, BB calls

River($345) 2♠

BB checks, Hero - ?