Dear {Name},
I am so sorry. I am the world's worst house sitter. I am so mortified that I {made mess/damaged item/left door unlocked/had party/lost pet/etc.}.
You placed your trust in me, and I broke it. I really have no excuse, but I promise that I will reflect on what personal failings led me to be so uncharacteristically irresponsible.
Please let me know how I can make it up to you. I'd be happy to {return money/pay for damages/etc.}.
Sincerely,
{Name}
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