<human>: Can you condense the text into a few key points?

Please help, I need advice from someone who understands Borderline Personality Disorder. 

I love this girl and things are often really great, but lately it's been harder and harder. She has her own issues, and she doesn't let people in very easily. I crave the intimacy and relationship that she doesn't give out so easily, but when she does, she is a very sensitive, caring person. 

When we connect, it's very good. But I struggle with the chronic feelings of emptiness that come with BPD, and my emotions and perception are so unstable. I end up doing things that hurt her. One minute I like her a lot, love her; the next, our relationship isn't enough, she doesn't invest back in me, and she doesn't care, which causes deep heartache and sometimes I drive myself crazy until I go fuck it I don't care, as a defense mechanism. When I realize that I have been insensitive to her later on, it sucks. Bad. I realize she's the most precious thing in the world and I feel absolutely horrible and wish nothing more than to make it up but I can't. 

She doesn't like to be hurt at all, and she will distance herself. This just drives me more crazy and so the cycle continues.

We are now on break so I can work on becoming more confident and stop relying on other people to feel good, but I go through such feelings of loneliness and missing her.

What a mess. Anyone that can help, especially if you understand the disorder, would be greatly, greatly appreciated.
<bot>: My borderline Personality Disorder is making me do crazy things to my girlfriend. I care about her a lot and just want her to be happy and for me to stop being all over the place.