Many people regretted spending their Bitcoin because, they don't know that it would become a high value asset in the present. Like my friend, who have a couple of Bitcoin years ago and have spent it on buying online products losing his asset that would have make him wealthy in the present. Maybe years from now, if people would not have hold Bitcoin, maybe they would again regret selling it instead of holding. Investing in Bitcoin is good and also risky but, we should trust it and whatever might happen, keep it, because I think Bitcoin has a lot of potential in the future.
But it was because of people like your friend that bitcoin reached the place where it is today, we cannot hoard our bitcoin forever or it is never going to become a currency that is actually used through the world and if that does not happens then we are never going to see bitcoin reaching the high prices that everyone wants, as you can see we are in a very interesting position, we need that people use bitcoin but they do not want to do it because they do not want to miss that growth but if they do not spend it then that growth will never come.