Dear {Mr./Mrs. Name},
I cannot tell you how sorry I am for breaking your trust. You confided in me that {brief mention of confidence} and I acted with complete and total stupidity. The only thing that I can say in my defense is that it was in no way intentional or malicious. I would never purposely betray your confidence, but I was simply not thinking when I {brief mention of the betrayal}.
I completely understand and respect your anger and frustration with me and I couldn't feel worse about {outcome of the betrayal}. I just wanted you to know that I am very sorry and that I will never be so careless again.
In sincerest friendship,
{Sender}
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