Dear {Recipient},

I'm sorry I didn't believe you about {topic}. You were right, {fact that they said was right}. I'm sorry I even thought that you would lie to me. I was so blinded by my own biases that I wasn't willing to listen to other people.

Please forgive my stupidity. If there's anything I can do to make it up to you, let me know.

Sincerely,
{Your Name}

Dear [Name],

I am writing to apologize for my dubiety. I know that it has caused you distress and I am deeply sorry for that. I understand that my lack of trust has caused you to feel hurt and betrayed and I want to make it up to you.

I understand that trust is a very important part of any relationship and I have let you down by not trusting you. I have been too quick to doubt your intentions and I regret that. I have been too quick to jump to conclusions and I understand that this has caused you to feel hurt and betrayed.

I want to make it up to you and I am willing to do whatever it takes to regain your trust. I am willing to take responsibility for my actions and do whatever it takes to make things right. I will listen to your concerns and take them seriously. I will be more open to communication and willing to discuss any issues that arise.

I understand that trust is an important part of any relationship and I want to work on rebuilding that trust with you. I am sorry for being dubious of you and I hope that you can forgive me. I am committed to doing whatever it takes to make things right and to regain your trust.

Sincerely,

[Your Name]

Dear [Name],

I want to start this letter by apologizing for my skepticism. I know that my attitude has been less than supportive and I regret that I have caused you any distress.

I know that you have been working hard on this project and I want to assure you that I now understand why you have been so passionate about it. I should have taken the time to listen to your ideas and to understand your motivations.

I realize now that my skepticism was a result of my own insecurities and I am sorry for letting my own doubts and fears get in the way of our relationship. I should have been more open-minded and supportive of your efforts.

I understand that my skepticism has been a source of frustration for you and I want to make it up to you. I am committed to being more positive and supportive of your efforts in the future. I promise to listen more and to offer constructive feedback when necessary.

Once again, I apologize for my skepticism and I hope that you can forgive me. I value our relationship and I want to make sure that we are both on the same page when it comes to this project.

Sincerely,
[Your Name]

Dear [Name],

I am writing to apologize for my suspicion of you without cause. It was wrong of me to make assumptions and to behave in such a manner. I understand that my actions have caused you distress and I am deeply sorry for that.

I want to explain why I acted the way I did. I was feeling insecure and anxious and I let my emotions get the best of me. I was worried about the situation and I let my fear and insecurity lead me to make assumptions about you that were not true.

I understand that my behavior was inappropriate and I am sorry for the hurt and confusion it caused. I should have taken a step back and thought more carefully before I acted. I should have been more understanding and tried to see things from your perspective.

I want to make it up to you and I am willing to do whatever it takes to make it right. I am willing to talk to you and listen to your point of view. I am also willing to do whatever it takes to repair the damage that I have done.

Again, I am sorry for my behavior and I hope that you can forgive me. I want to make it up to you and I am willing to do whatever it takes to make it right.

Sincerely,

[Your Name]

Dear [Name],

I am writing to apologize for not believing in your ability or goals. I know that this lack of faith has caused you pain and I am deeply sorry for that.

I understand that you have worked hard to achieve your goals and that my lack of belief has been a hindrance to your progress. I should have had more faith in your abilities and I regret not doing so.

I want you to know that I recognize the effort you have put into your work and I am proud of the progress you have made. You have shown me that you are capable of achieving great things and I am sorry for not recognizing that sooner.

I know that I cannot take back my words, but I am committed to being a better supporter for you in the future. I will do my best to be more encouraging and to have faith in your abilities.

I hope that you can forgive me for my lack of belief in you. I am sorry for not being the kind of friend that you deserve.

Sincerely,
[Your Name]