bb trash flops an oesfd

[fisherman112]

live 5/5 game, 9 handed
hero has 600 behind in the bb, villain has him covered
i understand i played this hand passively, but the villain was a very aggressive player when he liked his hand and i didnt want to build up a pot on the flop OOP to get most of my money in against trips when im only 43%. i dont like the way i played the hand at all, but i didnt see an appealing alternative.

8 [img]/images/graemlins/diamond.gif[/img]5 [img]/images/graemlins/diamond.gif[/img] in the bb, villain limps from EP, 2 other limpers, sb completes, hero checks

flop is 7 [img]/images/graemlins/diamond.gif[/img]6 [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/spade.gif[/img]

hero checks, villain bets 20, folds to hero who calls

turn is K [img]/images/graemlins/club.gif[/img]

hero checks, villain bets 100, hero ???