I was in a similar situation. This friendship was not as long, however, I had moved and she was someone I found in a new place, I thought we were good friends. I confided in her, as she did with me. Then she got pregnant and a very small disagreement occurred.
She flipper her lid and threw all of that in my face, as though her life was perfect. She smeared my name on Facebook, at work and with mutual friends.

The kicker here is that she later tried to "re-friend" me, but did not find in necessary to apologize, so I declined her invitation. Furthermore, HER problems reached critical mass and now she is the one without a friend that understands her situation to lean on.

I feel like there is some kind of saying about karma…..but this puts me is schadenfreude territory and I dislike being a hateful person.