Preflop, you already had 2 guys in, and one is raising .50, which means he has a little pocket pair or is enticing another raise so he can reraise with KK or AA. Come to find out, the guy stinks and has Q5 suited. What an idiot.

You should have made took the raise up to around $3 IMO, then folded if he came back with a bigger raise back at you. Instead he called the $1 and chased down his flush. Raise those premium hands. How long were you at the table? Did you know this guy raised on crap earlier?