Dear {Name},
I am sorry to have to tell you this, but I made a mistake on the {name of case/project/client matter}. I thought I was doing the right thing by {taking action/making promise} but I now realize I should have involved you from the start.
I want to fix this, but I'm going to need your help {how} because {reasons}. Please let me know when we can get together to address the problem.
Again, I'm so sorry for creating this mess. It's been a huge learning experience for me and I won't let anything like this happen again.
Sincerely
{Name}
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Index of letter of apology templates