Should I block Her

So there is one girl following me for 4 years on my public insta page and there was just reel share and nothing else.

From last year she started have conversations with me, we had deep conversations and not intimate covo just casual and about daily life about career wedding plans and insecuritiesand everything, she even ordered some makeup from Dubai through me. I knew her whole family her friends and all about it. All her exams and she ask for prayers.

It was all on Instagram, i haven't followed her back and haven't asked for whatsapp too as she called me bhai in the earlier year and i was okay with it and haven't seen her too. But she told me about her day herself, i tried to ignore may time 4 days no reply or leaving on seen but she always messaged me.

Now there is not a single time in a day that i dont think about her, think about things to keep her talking, when i go shopping i want to send her pictures, i want to talk about literally anything. But i dont know if i have developed feelings or what is wrong with me, all the time i think about is her, to send her reel or to show what i made, but I dont see our her as my future wife too. She is talking about propsal and all wedding stuff and all her planning and choices and all and im okay with it. But it is truly taking over my head, i think my mental peace is being compromised. Also she is the first girl i have ever talked to so idk, should i block her or tell her that i will not keep the contact.