Two hands: one good, one bad

[shiburu]

Both of these hands occured in a $.50/$1 online game.

1. I was drawing to a one-card, gut-shot straight (board: 569x, me: 88) against three opponents. At the turn there were two hearts on the board, and the river came 7 [img]/images/graemlins/heart.gif[/img], completing my straight, but putting three of a suit on the board. One player bet (as he had previously in the hand), but the next player (who had been calling like me) raised. The pot was laying me 5:1 odds to call with my non-nut straight with a possible flush on the board. With T8 and two hearts both possible (likely, as I thought at the time), and two players behind who could reraise, I folded. The river raiser showed down 34 for a 7-high straight, and took my $10. After reading SSH, I now know that folding the best hand on the river is the biggest mistake in Limit Hold'em, but given the pot odds, action, and possible better hands, was my fold such a mistake from a theoretical perspective, neverminding hindsight? I don't want this to be one of those hands that teaches me a bad lesson.

2. I flop the nut flush (plus royal flush draw) against 4 or 5 players. Betting had been capped pre-flop (which made me a little unhappy) and post-flop (which made me very happy). The board was K [img]/images/graemlins/diamond.gif[/img]Q [img]/images/graemlins/diamond.gif[/img]T [img]/images/graemlins/diamond.gif[/img] on the flop, me holding A [img]/images/graemlins/diamond.gif[/img]x [img]/images/graemlins/diamond.gif[/img]. I was feeling on top of the world when the T [img]/images/graemlins/club.gif[/img] hit the turn. My heart sank. The capping stopped, but the raising continued disgusting me. I flat-called to the showdown fearing the inevitable kings full, queens full, or quad tens. They all mucked and I won a pot at least 6 or 8 BB too small. Same syndrome as hand #1. Same question? Is hindsight making me question my own sound judgment?