Dear [Recipient's Name], I hope this letter finds you in good health and high spirits. I am writing to sincerely apologize for the hurt feelings I unintentionally caused you during our recent conversation. It deeply pains me to know that my words or actions have hurt you and strained our relationship. First and foremost, please allow me to express my utmost remorse for any pain or distress I may have brought upon you. It was never my intention to hurt you, misunderstand your feelings, or undermine your emotions. I value our friendship/relationship greatly and would never want to jeopardize it. I understand that my words/actions might have been thoughtless, insensitive, or lacked empathy. Please know that this was not a reflection of how I truly feel about you or our relationship. I deeply regret any pain or discomfort I may have caused you and I want to offer my sincere apologies for my behavior. I genuinely value your friendship/relationship and the bond we share. Your emotions are important to me, and I want to make amends and work towards ensuring that this situation does not happen again. I am committed to learning from my mistakes and becoming a better friend/partner to you. Moving forward, I would be immensely grateful if you could find it in your heart to forgive me for my actions. I genuinely want to rebuild the trust we once had and continue our journey together. Your friendship/relationship means the world to me, and I am willing to make any necessary changes to prevent a recurrence of this situation. I assure you that I will be more mindful of my words and actions and make a genuine effort to be more sensitive and understanding towards your feelings. If there is anything specific I can do to make amends or ease the hurt I have caused, please do not hesitate to let me know. Once again, I am truly sorry for causing hurt feelings and any distress this has caused you. Your friendship/relationship is incredibly valuable, and I will do everything in my power to make things right. Please know that you are an important person in my life and your happiness and well-being matter deeply to me. Thank you for taking the time to read this letter. I hope we can discuss this matter further and work towards rebuilding our friendship/relationship. With the sincerest apologies, [Your Name]