How far to push third nut

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I put him on the nuts flush. Calling me down with top pair and got excited when he made his flush. I can't put him on limping with pocket aces or calling with a set on the flop and quads on the turn.

His 4-bet should have woke me up. I guess I just don't get 4-bet too often which is why I brought it up here.

If you'll indulge me a bad beat story, I'm in one of the blinds with Q [img]/images/graemlins/heart.gif[/img] X [img]/images/graemlins/heart.gif[/img] and flop A [img]/images/graemlins/heart.gif[/img]-K [img]/images/graemlins/heart.gif[/img]-3 [img]/images/graemlins/heart.gif[/img]. I bet out the whole time. Someone in mid-position with 53o catches runner runner fives.