"we realize the true value of things once we have lost them"
Damn it Damn it Damn it :(
It's not easy to deal with this sort of problem. In my point of view, everyone makes this mistake. Agree with me, human? :D
It's something that you couldn't change. Yes, it has happened to me, it has happened to you, and it has happened to them. Nobody could possibly escapes. But if you have the will, you could ensure that it won't happen to you again. So stop crying. Instead, try your best so that there won't be regrets anymore. Got it? :)
Now, go and make it real. Start appreciating THEM.