Johnny,
A big congratulations to you for taking the necessary steps to your recovery

You're so on the right path

As for your fear of losing your girlfriend, I would say you have to STOP doing things that will damage your relationship with her. All your accusing her and saying things that hurt her has to STOP.
Another thing is that the more you feed the fear, the more you're likely to push her away. It's a BPD thing whereby because of the fear of abandonment, we FRANTICALLY do stuff (like sending frantic text messages and so on) to avoid the abandonment. But it's those frantic actions / efforts that cause the abandonment to really happen. So the next time you feel like you're going to lose her, I recommend this:
a) DON'T take any action like frantically calling her
b) pause and examine the evidence
By the looks of it, I would think that she's planning to stick by you. The very fact that she was brave enough to confront you with your bpd shows how much she loves you. The very fact that she would take time to read the Eggshells book is another evidence that she loves you.
So remember, this relationship is in your hands - you can ruin it with your frantic efforts to avoid abandonment, or you can have a loving, supportive girlfriend by your side.
Kudos to you once again. The journey of recovery isn't easy, but it's worth taking
