It really sucks when you want something so badly, and you can't have it. Like when you're a little kid, and you really want a toy, but your parents won't buy it for you, for whatever reasons. You just keep wanting and wanting until, YES! You finally get it. Then, two weeks later, you have forgotten that its underneath the steps in front of your house. Out of sight, out of mind.
Then, after a while (it could be days, weeks, months, even years) your bratty next-door neighbor has got your toy, and all of a sudden, you can't live without it again? But then once you've got it back, you don't play with it?
Same thing goes in life... you want want want, what you can't have, until its yours, then, you don't want it anymore. It just sucks. One moment bliss, the next heartache.