Just as I Thought

Just as you thought you're enough... Just as you thought you're complete... And just as you thought you've found the one... But suddenly that thought just fades away not knowing why.

"It's not you, it's me." What's that really supposed to mean?

How can you get over with the things you've once shared with each other? How can you start all over again, when the biggest part of you have already been broken by the one that completes you?

How would Ash be able to find her safe haven after the most heart breaking moment of her life?