I can relate to you. I was sitting in a hospital recently with a sick family member, and even THEN I thought about the Spurs loss.
The only way to look at it is as cold hard statistics. The odds of losing Game 6 at that point were about 1% I'm told. Then you throw in the fact that we also could have won Game 7 and the odds of losing the entire series when were were up with 28 seconds in 6, were about 1 in 200.
But, if I recall, we were the first playoff team to ever come back from such a deficit in so little time in Game 1 of the Warriors series. The odds on that were between 1 in 300 and 1 in 1000 depending on who you ask.
So, during the Spurs playoff run, the Spurs themselves had one statistically miraculous comeback go their way (against the Warriors) and one go against them (the Heat). It happened both ways. We were neither lucky nor unlucky. It's just the random outliers of probability.
It doesn't really help much, I know. But if you bemoan the Heat loss, then we should remember how damn lucky we got against Goldenstate Game 1.
That said, I'll remember that loss forever, just like you, and many of us on this board.
Look forward to a great season!