Facing 5 bet on flop = Mortal Nuts?

[Roadstar]

Haven't posted in a while.

100NL

Villain and I are deep $250 stacks

Villain is probably slightly TAG 20/15 or so, no big reads other than he doesn't go psycho aggro for no reason.

I have J[img]/images/graemlins/spade.gif[/img]7[img]/images/graemlins/spade.gif[/img] in the BB

Preflop

2 limpers, SB (villain) completes, I check

Flop

K[img]/images/graemlins/spade.gif[/img]Q[img]/images/graemlins/spade.gif[/img]8[img]/images/graemlins/spade.gif[/img]

Villain bets $2, I raise to $8, folds to villain who goes $30, I go $100, Villain pushes... Hero seriously contemplating folding...

is there anyway this isn't the nut flush given the 5 BET ?

Not meant to be a bad beat post. Please consider this is 250BBs and I'm drawing dead if against nut flush, 60+% favourite over set.

Thanks