Hey shimtie,
You are welcome to start a "New Topic" here regarding your experience. This topic/thread was created long ago, and it is fine to use, but other users may not read it. Your own New Topic will stand out more, increasing the odds of a reply.
As for your experience, while we cannot diagnose here, if she does HPD, then what you described matches what others have written who are (or have been) in a relationship with someone with HPD.
All of that idealization and intense focus on you was no doubt initially is very compelling, a big ego booster. Also because people with HPD may mirror others, that can feel like 'I've met my match'.
Over time though, as you experienced, yea, that changes. This is hard to accept, because that idealization of us seemed so meaningful, and the implications of seeing the truth is a bitter pill to swallow.
I think it's near impossible for most people to conceive of what life would be like to have an obsessive compulsive need/want for attention, and the more the better, from almost anyone. Of course we all need/want some attention, but it doesn't drive us to the point of exclusion of nearly all else, or cause us to forget those who are important to us just to get another fix of attention. I wrote fix, because it really is like a drug addict who constantly needs more to get that same high, and so they more they get, the more addicted they become. For the person with HPD, their drug is attention. The people who provide attention matter less than the attention itself.
From your point of view, yes, it is understandable why that hurt you.
Again, feel free to start a new topic.