I agree.

In this world we can only be responsible for our feelings and our behavior. The expectations for forgiveness are your expectations, not those of the other person. And we cannot truly affect someone else's behavior or control their response. We can only do what is right from our own point of view and you have done that.

Remember you can only control and modify your own expectations and cannot project them onto others.

So do not punish yourself for this person not accepting your apology. That is their issue to resolve now not yours.

You have done the right thing and all you can do by apologizing. You ned to modify your expectations now to that of the situation ad accept it and move on.

Try to take the positves from what happened and evolve because thats all we can do is to evolve through our experiences.

So let go of the negative engergy and give it some time. People process feelings and information and anger at different speeds. Maybe they now just need more time.