__________ (Your name)
Date: __/__/____ (date)
My Dear husband,
I write this letter in order to apologize for not trusting you. I lost my control and started believing that you are lying for whatever you said. I should have trusted you and waited for your point of explanation. I am sorry and apologize for whatever I have done.
I believe you would consider this letter as a genuine apology. I promise that this won’t be repeated again and I would keep my faith in you and trust you for whatever you say.