Is this normal or obsession?!

Buckle up because this is a long ride

So I have a best friend and we have been friends for 5 years since high school but it was corona time and we only spent a term together then we continued talking to each other online because we went to different places in college at first she always started the conversation but after a while I also got attached to her and she always cared too much about me we nearly talk to each other everyday and somehow she would always recognise if I am sad or mad and I really liked that she was so dependent on me. Backstory time "she also had some bad habits which I learned I think in our third year of talking she would sometimes hurt herself and after I knew that I spent a long time convincing her to go to a therapist or something and she agreed and he diagnosed her with bpd (borderline personality disorder) and well that's kind of normal because her family is shit and they tell her she should have died and a lot more also I learned from this that I am her favourite person but favourite person in this case is like any action I do affects her and like she is extremely dependent on me but I didn't mind because I liked it, after that she went for a couple more sessions and she got a whole lot better "that was half a year ago"
Anyway, back to the present. I feel like these days she doesn't talk to me a lot and I was mad at her for that and I called her and talked to her for a little bit but she still couldn't tell that I was mad or anything like she always did honestly that made me feel kind of terrible. I know she is busy with her college projects and she has more friends than before and that's what I always hoped for but I feel like the special bond we used to have won't be like it was before
Anyway after writing all this I think I was just venting my feelings because no one knows me here ╮(￣▽￣)╭