How weak of a fold is this?

[TheJackal]

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (9 handed) converter

SB (t9755)
BB (t9398)
UTG (t8630)
UTG+1 (t21860)
Hero (t16555)
MP2 (t16879)
MP3 (t6065)
CO (t8875)
Button (t14235)

Preflop: Hero is MP1 with Q[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
UTG folds, <font color="#CC3333">UTG+1 raises to t300</font>, <font color="#CC3333">Hero raises to t750</font>, MP2 folds, MP3 folds, CO calls t750, Button folds, SB folds, BB folds, UTG+1 calls t450.

Flop: (t2475) 5[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+1 bets t750</font>, <font color="#CC3333">Hero raises to t2000</font>, <font color="#CC3333">CO raises to t8125</font>, UTG+1 calls t7375, Hero folds.

Turn: (t20725) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>

River: (t20725) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: t20725

Results in white below: <font color="#FFFFFF">
UTG+1 has 4c Kc (flush, king high).
CO has 9d 9h (one pair, nines).
Outcome: UTG+1 wins t20725. </font>

WTF can I do, his call is pretty bad IMHO. I know if I move in he is going to call. The only good thing I can take away is that I had them both pegged for what they had. I thought the all-in was like JJ, and I thought UTG +1 had a flush draw. With all the money in the pot, it was a god awful fold, but I didn't want to lose all my chips on a coinflip. I hate his call here, he is risking why too much on a flush draw, had he folded, it's an insta-call for me. I also think I needed to bet more on the flop and preflop...