If you would like to apologize for cheating on your partner, here is a sample template you can use to write an apology letter after cheating.
I am writing this letter to express how deeply I regret my unjustified action of cheating you. I am highly ashamed and embarrassed about my actions, and I have no reasonable excuse to justify my behavior. I admit that I have made a terrible mistake.
Also, there is no valid reason for you to forgive me for all the pain I have put you through. Yet, I deeply apologize for my actions and seek your forgiveness. I reflected on my mistake and realized how strongly I wanted to fix the mistake I have made.
If you find it in your heart to give me a second chance, I promise to never let you down again.
Once again, sorry!
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