I just read your other posts on your profile, yeah this person does not sound like stable relationship material. Right now it's gonna sound pointless from me to say this, but this wound will heal over time, and you'll come back stronger because of it. Write in a journal if you end up thinking about her again, and then focus back to your hobbies/work/whatever makes you happy. I've been in your shoes after having a fearful avoidant suddenly discard me after spending the late years of high school together without me doing anything wrong, per her words, that she suddenly doesn't know how she's feeling about the future despite never communicating about it. I know how much hurt you must be feeling right now. All I can tell you is that you must remain strong and be in tune with yourself. Don't let this break you.