$200 NL Hand, Flush on river, unpaired board

[XXXNoahXXX]

$200NL, Villian has $174 and I have him covered.

UTG limps, Villian minraises, folds to me in the BB and I call with 45 [img]/images/graemlins/diamond.gif[/img]s, UTG folds to minraise (?!)

Flop comes QK4 2diamonds.

I bet out $8, Villian calls.

Turn is the 7 [img]/images/graemlins/club.gif[/img].

I bet out $20, Villian calls.

River is 2 [img]/images/graemlins/diamond.gif[/img].

I bet out $45, Villian pushes all-in.

Did he make the higher flush? Should I find a fold here or is he bluffing...

Brief table history: I've done a couple resteals after he constantly raises any pot with lots of limpers. He has shown down a slowplayed AA loser, KK winner. and a few winning hands with about a 50/50 split between whether he should or shouldn't have stuck in on his draws.