Yes, I get that. I have an email drafted from nearly 2 years ago to my friend, but I haven't sent it and won't send it. Because I actually think she will be unpleasant about it.
I think (but don't know) that I am further on with this than you perhaps. I am now accepting that there isn't a friendship to speak of and I don't find it upsetting any more. If anything, I am angry that, despite my best efforts, she's letting go a friendship of 55 years. Who has one of those, it's very unusual and we should've been able to move on from this. The 'inciden't was nothing in the context of a friendship of decades.
It does sound like you were perhaps both at fault. Do you think she would think that too? Or would she think it is just you?
I actually think my friend is at fault, with little fault on my side. I imagine she thinks the reverse so to try and clear this up, for me, would be horrendous.
I just wondered if your friend knows there is fault on her side too, that you both contributed to the end of this friendship, whether she might be feeling anyway similar to how you are?
I get the rejection bit though totally. It could be liking going back to square one and trying to heal yourself again