Not a bad beat. Not a great decision by the caller, but it's not a bad beat.
In my opinion, a better way to have played the hand would have been to call the flop. When the third heart came out on the turn, then you slow down. If he moves in on you, you fold. If the heart doesn't come out on the turn, he's not going to call your all in. But, on the flop he has 37% chance to make the flush as opposed to 19% after the turn card misses. If i were him, I wouldn't have called that large of a bet. I just don't like to put my stack at risk on a draw against a made hand. I prefer to put my money in when I have the best of it. But I would have waited until the turn to determine if I had the best of it.
When you put someone in like that, they can only call you with a very strong hand or a strong draw. That's what he did.
Be careful with KQ in NL hold em. They say it's a decent hand that plays well in multi-pots in limit, but in NL you can get into way too much trouble with it. I mean, you hit the dream flop, but a risk-taker outdrew you after the flop.