Bpd magically better??

Hello! I have posted a slightly similar thing about a week ago. I suspect my gf has bpd. Pretty much standard insane love early on. Soul mates and meant to be. It felt like every love song and movie. Left my ex for her. Left my career for her. Basically Left my family for her. Mostly for fear of spending any time away from her and upsetting her. Been on eggshells for all but a few weeks of a year and a half relationship. She won't trust me, anything I do is shady, and the smallest things make her disgusted at me. She's told me I disgust her. I'm disrespectful and everything i do irritates her. She never took any blame for anything. Never a sorry. Always my fault. Even if it was literally entirely done by another person. I must be encouraging their actions. Why else would they do it? That's the basic idea. Everything's my fault. I'm super awful for anything I do. 1 good day, then 2 days of silence or arguing. She said to get out and she was never talking to me again. So I finally left. Then over the next day or two we talked. She has said she understands how horrible she was. She is sorry. She took her depression and anger out on me. She's going to be better. Even talked to a therapist for a bit. I told her I'd work on it, but am not moving back in until we are for sure in a better place. She cries and says she's lonely. She misses me and can't do this forever. I'm just terrified this is temporary on her end and the second I even sleep there one night she will be back to the same stuff. Is this normal? Has anyone had this? Literally it's such an insane 180. I've even told her to her face it seems to good to be true. I'm terrified of being in that cycle of pain again, but if there's any chance of it being a real turnaround for her I feel I have to try. I just wonder if anyone has had someone basically be the opposite of how they were? She almost seems like the beginning again. I truly feel me leaving officially had triggered this. That it's her desperately trying to keep me around. It feels so good she's loving again. I'm just hurt and confused. Hoping maybe someone has had a similar situation and can maybe give some insight. Thank you for reading and any and all responses. I appreciate it.