Yeah, I totally understand this as I am currently dealing with a form of it myself. Somehow, in dealing with boundary issues in my life, I neglected to learn how to deal with them in intimate relationships, so I barely have any.

Point is that it's an issue of boundaries. When people feel that theirs are being encroached upon, they are very likely to pull away, even to the point of shutting communication down completely, because they need to find some way to re-assert the space that's been encroached upon. Think of it this way: if someone came up to you on the street and started getting in your face, you'd take a step back. If they continued to get in your face, you'd continue to step back, maybe even to the point of running away. Now, it's a little different in a relationship when we're talking about emotions, and when a person knows you. But the concept is very similar. When we get to clingy, it doesn't give a person much room to breathe and move about in a relationship and just...be.

She said she was done. To be blunt, true love would respect the others person's wishes to be done. What the predominant feeling seems to be here is infatuation and need. Given enough time and space, this will wane, because she is not meeting the need that you have for love and validation. I know it is difficult, but the best thing to do now is stay busy. Pick up hours at work if you can. Get outside. Go for a drive. Do anything, but for goodness sake, stay away from the phone and computer.

Good luck.