Appreciation....??

Is it true that guys will only appreciate the other half when things already comes to the worst and there's not turning back? Recently knew that my ex pick up a hobby that I'd been loving only after we have get apart for a year. I still remember that during the days when we were together, he doesn't even mind to spare some of his time to have the hobby together but instead will rather stay at home. And now, he even took up classes just to excel in that hobby. Frankly, I do really feel a bit sad when i know about it, and once again, proved to me that, I had make that right decision....