Disclaimer: Highest I play is 5/10.

Forgive my ignorance but why are we ruling out QQ here?

if he held QQ, smooth call the $200 pf.
Bets about 2/3 pot with flush draw on flop after being checked to with top set. He wants action.
He assumes you called on flop with the flush draw.
Turn gives him the 2nd nuts, so he checks behind to let you hit your flush draw so you pay him off on the river.