“The Letter”

A friend had done something to her and after a terrible argument they stopped talking. One day, she received a written apology, she accepted it and their friendship rekindles. She did not discuss the letter with anyone, but she kept it. Many years later, her husband asked her if she and her friend ever had an argument. She told him yes they did, but her friend apologized.
“If she apologized, why did you keep the letter?”
“I did not tell you her apology was a written one. So who told you that?”
“She told me about it and she said that she hopes that you got rid of the letter. I found the letter and I burnt it.”
“What!”