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my opponent is talking to me. i dont believe him on the flop. im not gonna believe him on the turn either. but i think he will speak the truth on the river.

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If you believe that he can 3 bet the flop and lead the turn with an unpaired hand there's no reason to believe that he's going to magically stop on the river. This is one of those scenarios where your brain registers winning 1 out of 10 as "never". Once you make it this far you really can't fold.