fold costed me half the pot

[Bunch]

hero posts on the co with Q [img]/images/graemlins/heart.gif[/img] 10 [img]/images/graemlins/club.gif[/img]. mp1 calls mp2 calls, folds to hero who checks, sb calls bb checks. flop is 9 [img]/images/graemlins/club.gif[/img] J [img]/images/graemlins/club.gif[/img] A [img]/images/graemlins/diamond.gif[/img]. sb checks, bb bets, mp1 raises, mp2 coldcalls, hero cold calls , sb folds , bb calls. Turn K [img]/images/graemlins/club.gif[/img]. bb checks, mp1 checks , mp2 bets , hero calls, bb folds , mp1 calls. river 2 [img]/images/graemlins/diamond.gif[/img]. mp1 donk bets, mp2 raises, hero folded (ugh). mp2 had qt, no flush. What do you think about that fold there, and also just the call on the turn with the str8 and flush draw?