u/OrganicLingonberry75

I’m looking for honest opinions, not validation. I also want to acknowledge that this is only my perspective, and I don’t know what was going through my friend’s mind. If you think I handled parts of this poorly, please tell me.
For privacy, I’ll call us A (me), B (my friend), and C (the guy).
A and B were close friends for about six years. During high school, I told B that I’d liked C for years. It wasn’t a secret, and she knew how important he was to me emotionally.
One day, B sent C a friend request. They started talking, and within about two weeks he asked her to be his girlfriend.
Before saying yes, she messaged me asking if she should accept. Looking back, I don’t think I was in a position where I could genuinely say no. I wanted to be a good friend, but I also felt completely heartbroken.
That situation affected me much more deeply than I expected. It wasn’t only about losing someone I liked. It felt like I had also lost my closest friend. My mental health deteriorated over the following months. I developed panic attacks, struggled with body image, started emotionally eating, isolated myself, and my academics suffered badly. I eventually went to therapy.
Months later they broke up. Part of the reason was that she was uncomfortable in the relationship, but she also told him that I would never accept their relationship because I’d liked him for years. He then contacted me briefly and immediately blocked me. I hadn’t asked to be involved, so that reopened a wound I had been trying to heal.
After some time, my friend and I reconciled. We cried, hugged, and eventually became roommates.
During that period, I cared about her a lot. I cooked for us, packed meals, cleaned the apartment, helped with university work, and genuinely enjoyed doing things for people I loved. Looking back, I also realize I tended to over-give and had very poor boundaries.
Later she started dating another mutual friend. I was actually happy for them. Another friend and I even helped plan one of their early dates because we wanted them to have a special memory.
Not long afterward, she moved out, saying the commute to work was difficult. Later I realized she had moved into the same place where her boyfriend lived. What hurt wasn’t that she moved. It was feeling like she hadn’t been completely honest with me.
Over time, we drifted apart. We rarely met anymore, even when we lived relatively close. I stopped reaching out as much because it felt like I was always the one trying.
Eventually, I had to move back home due to circumstances outside my control. I didn’t tell her until after I had already returned because, by then, I didn’t feel emotionally safe sharing vulnerable parts of my life with her anymore.
Recently I noticed she had removed and unfollowed me on social media. Oddly, I wasn’t devastated. It felt like confirmation that the friendship had truly ended.
Since then I’ve spent a lot of time in therapy and journaling. I’m genuinely doing much better now. My confidence has improved, my academics are back on track, and I’ve learned healthier boundaries. I don’t want the friendship back.
What I still struggle with is understanding what actually happened.
Was this friendship unhealthy from both sides?
Did I over-invest emotionally and create an imbalance?
Was she emotionally insensitive, or am I viewing everything through the lens of my own hurt?
If you were in either person’s position, how would you see this?
I’m genuinely looking for perspectives, especially from people who have experienced friendship breakups. Please be kind, but don’t hesitate to be honest.