Apologize to old friends?

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Hey /adv/ first time posting here.

About 6 years ago I cut ties with all of my friends and our social group kinda went in a few different directions.

Sparing the details (long very autistic highschool drama story), I feel that I treated a few of them unfairly. Even though the whole group was toxic and we all spoke ill of eachother at one point or another, I feel I need to apologize to a few of them who probably didn't deserve it.

I guess I need advice on if opening old wounds to try and explain my actions and acknowledge my faults on how I handled things is ever worth it?

One of my old friends I fear has self image issues that I may have contributed to, another was like a brother to me until he betrayed me multiple times and I was constantly trying to be more alpha than him.

Another was a girl that was my everything, but kept me in the friend zone for years seemingly on purpose (who my best friend betrayed me by dating which will not be forgiven)

My aim isn't to be friends with any of these people again, but to at least get things off my chest and see how everyone is doing.

I haven't had friends in the entire 6 years since I deleted everyone from my social media and started ignoring their calls. I felt like I had to distance myself from them, which has matured me a lot, but at the same time I am tired of being lonely with this burden.