my best friend doesnt want to be my friend anymore, i dont know what to do

i've been with my boyfriend for 6 months now and we are taking this as a serious relationship. i wasnt that much of a texter online, but i will admit i spent more time texting my bf rather than my friends esp at the beginning. one of my best friends has been struggling with some issues for a while now, and i listened to her speak about it and supported her in what way i could (i still do), but for the past month or so she hasn't been at school, where i can see her and talk to her in person (better than i do online). with our exams coming up, i've been spending majority of my time studying as i have a lot of pressure from school and parents. i tried to check up on her by texting her things but i didnt know what/how to text as i didnt know if she was comfortable speaking about how she was. but whenever i tried to make conversation online, she wld leave me on opened or reply dryly. id send these like 2/3 times a week. even before my boyfriend i was never someone to constantly text or call my friends and now with him and exams i prioritise my studying and text him when i can. when im in a relationship i tend to give my all (is that a bad thing?), not to say i ignore or cut off my friends, but if i truly like him (and i really do) i will try and make the most out of my relationship. i started to feel quite down about our texts (me and my friend) as i could tell she didnt want to talk to me. i thought maybe it was one of her ghosting phases but with our other close friend she was texting her and being rly close to her. i tried to send her a video abt how i did my hair for school one day (i dont know how to text online lol) and she sent a paragraph about how this wasnt a friendship and that i was gaslighting her about how i said i would change bc i was spending too much time with my bf and "forgot" about them. i do think i am getting better and splitting my time between my friends and boyfriend in person. i spend more of my lunches with my friends and im talking to them about loads of different things, but she isnt in person to see this, so the online aspect i am trying to get better at. however she said that everyone has school so it wasnt an excuse, which i sort of disagreed with because i take an extra a level and my parents are very strict with my studies (unlike hers). i never intended for her to feel ignored and i never wanted to not be her friend. over time, when i get more comfortable in my relationship i know i will find the balance between him and my friends. my other closest friend of 5 years who too felt me spending less time with them, told me id never want to lose you for a friend and id knew you would eventually come back to me bc we are very good friends. i will always support my best friend despite her not wanting to be my friend. the only thing is she is now reposting tiktoks of my bad actions and *****y friends. i would want to be her friend again in the future but im not sure she would want too.