You give no indication of stack sizes, and I'm a bit unclear about the positions of the players, but if you're both all in I can't see you did anything wrong.

If you were in exactly the same situation 3 times, on average your opponent would hit his flush once and win $x, and miss it twice when you'd win $x each time. Overall your play has positive Expected Value (+EV), which means you'll show a profit with it in the long term.

This particular hand was the one time out of three that you lose.

I hear they will draw to flushes for stacks often at party, they must be giving out t-shirts if you bust someone's pair.

If you are reasonably certain when you made the call that you were ahead, you shouldn't worry about it, that happens.

If you were both super deep, I might say folding was the correct play, you over bet the pot he pushed. This usually indicates a set to me. If you have reason to believe he pushes with draws you must gamble it up, even when he is deep.

Often when I hold JJ or QQ I take the SuperSystem approach to a reasonable reraise. I will call see the blank on the turn and push on my own. Your opponent didn't afford you that opportunity but it is something to consider when they do.