I was going to write a long post after reading through this thread, but changed my mind and will tell you this instead:
The day I realized that I couldn't fix everything, couldn't save everyone, couldn't do all things, wouldn't understand all things, couldn't be perfect, I cried.
When I truly understood that my body would age and even betray me, that my mind could indeed be forgetful, that my heart wasn't always compassionate, and my soul not always open and honest, I cried.
I am not trying to be overly dramatic, but perfection means that much. Trying to be perfect may be illogical, but that still does not detract from the desired attainment of it. (We're like the Borg; resistance to that inner calling is futile!)
Your girl sounds like she has put up walls to protect her from these truths, to deflect from the harshness of them. You pointing out to her she is only human is probably not the reality check you think it is, it is paramount to telling her she is a failure.
If there is a chance for you to get back together, be gentle in this area. Be yourself though, don't just cave in to her emotional states. For any relationship to work, it requires honestly and willingness for both parties to "meet in the middle". But if I was with a man who continually wanted me to face my imperfections, it would be hard for me too. I already feel painfully aware of where I am lacking.