[ElsatheDepressionSlayer]

As a random stranger on the internet, I obviously can't diagnose your girlfriend. But it sounds to me like she is borderline. All the things you described fit with BPD, and I've had a close friend who was borderline and acted in many of the same ways.

Talk to her. Don't confront her and ask, "are you borderline?" or anything like that. But be kind when you bring the subject up. Borderline or not, your girlfriend, DEFINITELY needs therapy, and you should encourage her to seek help. I hate to put it in such bleak terms, but if she refuses to get help, your relationship is basically doomed. I went through it with my former friend: our friendship was very unhealthy and I finally had to leave for my own sanity. I found out later that she has BPD, which explains the behaviors that pushed me away. As much as you love your girlfriend, she is not a healthy person for you to be around if she continues these behaviors and refuses to change.

I hope she gets help and things smooth out for you two. However, if it gets to the point where you need to leave, do so. If she causes more harm than good in your life, she is not a healthy person to be around, and you may need to leave for your own wellbeing.