[friend_]

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River is a fold unless he is in love with AQ/AJ and with your reads apparently he is not a complete moron. Flop raise might be good.

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Folding on the river, having 1:3 on a call with TPTK without seeing any real strenght from villain is a huge mistake.
If you are so timid, then raise on the flop without putting any money after this. This is much better, than calling to the river and then folding to a medium bet.