Hey
@Glassguy sorry about all this man. Sounds like you had a good thing until this sh*t went down.
I wouldn't blame it all on mental illness though, women are emotional creatures, often irrationally so when it comes to their emotions,. She just happens to have bi-polar likely in conjunction with BPD (borderline personally disorder, cluster B) which is not uncommon and adds to the cray especially the Borderline.
Did she leave an address where she's staying in her note? Did she block you? I ask because she admitted to feeling insecure and it could be a sh*t test, she's watching now to see how hard you'll fight for her. It's happened to me a few times, I'm pretty familiar with these types of sh*t tests.
When younger, I would chase, and it only got worse. Now I just let em go, go NC and they come back eventually.
IME the most egregious part was that she led you to believe everything was fine, was playing all cute and cuddly and the following day while you were at work, she left.
That's low and basically unforgiving. If she needed space to regroup her emotions, she could and should have talked about it with you, NOT left a damn note. That's what people who give a sh*t do, they don't just leave after leading you to believe all was well the night before.
I don't think this is over tho. After a time once she realizes you are done and not gonna chase, she'll have a rethink and be back. Could almost guarantee it.
You're gonna be longing for her too, you're human and you're really into her, that doesnt just go away overnight it'll take a while, so think about how you will respond when/if she returns.
Good luck man ane keep us posted.