Trip 7s demolished

I had 77 in the hole.

Flop comes 7 + two spades.

I figure I have to bet to stop any potential flush.

So I bet, about x1.5 the pot.

1 player calls.

Next card a blank.

So I move all in - if the board pairs I got a full house and the odds are around 35% on another spade coming out.

As I played an amateur, he called.

And the flush arrived. Sick.