Folding the nut flush with outs

[spydog]

[ QUOTE ]
really really aweful I think. Just get to showdown.

Krishan

[/ QUOTE ]

The TAG sees the following, which is more important to what I am holding:

1) My preflop raise
2) My flop bet/3-bet despite him showing considerable preflop and flop strength.
3) My turn bet/3-bet
4) A paired board
5) A 3-flush board

Yet, he still caps? And this is a really really awful fold?