I have a problem folding sets--44 flop fold

[Megenoita]

Recently I was playing 3/6 and I had 33, raised, a tag IP called, and a fish called. The flop came 8 9 3 r and the fish donked a good portion of his stack, I raised to 240, the tag pushed, and the fish called. I put the tag on 88 or 99, couldn't see why he'd push a dry draw. I folded, and he had KK.

Lately, I've been seeing that I fold too much in general, but I think I'm not bad overall.

Villain in this hand is 18/12 tight, solid tag frankubrik or something like that. He is 2.2 and multitables with me a lot. My impression of him is not that he gambles a lot, but that he plays really solid.

Thoughts on the fold? My flop raise was actually purposefully so that I could ascertain whether I was beat. Against most guys, I just push the flop initially.

Party Poker No-Limit Hold'em, $ BB (6 handed) pokerhand.org hand converter

CO ($787.58)
Button ($380.16)
SB ($1082.87)
BB ($512.67)
UTG ($2795.18)
Hero ($1007.55)

Preflop: Hero is MP with 4[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $3.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $21</font>, <font color="#666666">1 fold</font>, Button calls $21, SB (poster) calls $18, <font color="#666666">1 fold</font>.

Flop: ($69) 4[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>

Villain bets $50, Hero raises to $190, fold, villain raises to $350, Hero folds.