I'm sorry you are here and hurting. I hate to ask this, but unfortunately reality hurts...Do you think or know if there is someone else?
What are your shortcomings? Please elaborate on what her complaints are and what YOU felt you did wrong.
The Vets will need details to really help you. Also it's the weekend and it's a little slow here, but will pick back up this week. Ok? So be patient.
My advice to you right now is to STOP pursuing. Give her space and DO NOT make any contact until you get some advice from here. POST ALL YOUR FEELINGS HERE.
I'm going to bump up and link a DB List for you to read. It's VERY important that you follow the steps right away, ok? Be patient and try to elaborate your situation.