It allows you to move forward and get to the good parts. The part where you know that nothing is permanent, everything changes. Where you can decide what you want and be who you are.
This!
And remember, while this seems really rotten right now, you have no idea what direction your life is going to take in the future. Yesterday I had a blast rehearsing with my punk band, this morning my drop-dead-gorgeous boyfriend brought me coffee. I sure couldn't have foreseen this when my marriage was collapsing.