Dear {Mr./Mrs. Name},
I am so sorry that I spilled your secret to {Name}. It was a thoughtless, irresponsible thing to do. I didn't mean to hurt your feelings or betray your trust; it just slipped out and I felt horrible as soon as I realized what I'd done.
I know that you're mad at me and I completely understand. I'm not going to try to make you forgive or trust me again, but I just wanted you to know how sorry I am and how badly I feel for hurting our friendship this way.
Sincerely,
{Sender}
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