I reconnected with two people recently, I won't drop their names for privacy reasons so I'll just refer to them as R and T.
For context my therapist had recommended I write a doc containing an apology, and send it through a friend to forward to them. If they accepted I send it, if not I delete it.
The former happened, as you can guess.
I was able to get some closure from them, and they've forgiven me for what had transpired, especially since T feels guilt over the fact that he feels like he just added to the mountain.
Unfortunately, T's s/o, F, has chosen not to forgive me, but appreciated the gesture of me reaching out and sending the apology. I'm disappointed by that outcome but as long as I got the answer, I'm okay with it in the long run.
But I'm back in contact with R and T now, I do plan to keep some contact to a minimum and not bring up past events that affected us greatly (and not vent as much too), but I'm glad we're on speaking terms again.