I think it's possible you've been watching too much "Live at the Bike" and poker on t.v.
You're thinking he's bluffing $750 with a weaker hand than yours? Since you're aggressive, you could have been betting with a flush draw. Or, maybe KQ.
I don't see this situation as a bluffing opportunity for Villain. He would have to have brought his ego with him to the table, have you get under his skin, & be willing to dust off $750 trying to teach you a lesson.
Villain gave you a decent price OTT to draw to a flush.
You think OTT that he's thinking: "Well, I have the A
, so if I bet $125 & then shove OTR if another spade comes, he may stop & think for a minute & realize that my bet OTT was a blocking bet to get a good price to draw to a flush [which I don't have] and even if he has a flush, I have the A
& $750 is a LOTTA' $$, & he's too weak to call with a Q high flush."
You think that's what he was thinking on the Turn?