I am writing to apologize for the mental suffering I have caused you. I understand that my words and actions have had a negative impact on your mental wellbeing, and I am deeply sorry for that.
I have been reflecting on my behavior and I have come to the realization that I have been insensitive and inconsiderate. I should have been more mindful of your feelings and I should have taken your mental health more seriously. I am sorry for not doing so.
I understand that I cannot undo the hurt and pain I have caused you, but I want you to know that I am committed to making amends. I am willing to do whatever it takes to make things right and to ensure that I never cause you any mental suffering again.
I am also aware that my apology may not be enough to make up for the hurt I have caused. I am willing to take any steps necessary to make up for my mistakes, including seeking counseling or professional help.
I am sorry for the pain and suffering I have caused you and I want you to know that I am committed to making things right. I hope that you can find it in your heart to forgive me.