[anatta]

You imply some significance to the fact that your friend remembered one hand where he folded the winner, and then say don't say this is results oriented? C'mon man. Play the percentages. If they say fold in a given situation against a particular player, then fold. In a game of imperfect information, every so often you will fold the winner. WTF, one hand.

And yeah, check-folding the river with a pair in a big pot is usually a bad idea. After all, usually part of the reason you would call the turn raise is your opponent's "full of [censored]" factor. No matter what comes on the river, if your stats says his FOS% is above 8, you almost have to call.