Dear [Name],
I am writing to apologize for my recent behavior. I know that I have been acting out of jealousy and it is not an excuse for my behavior. I am sorry for the way that I have been treating you and the things that I have said.
I know that my jealousy is not a good thing and that it has been causing a lot of tension between us. I understand that it is wrong to be jealous and that it has been affecting our relationship. I am sorry for not being able to control my emotions and for not being able to be more understanding of your situation.
I want to make it clear that I do not want to be jealous of you and that I want to be supportive of you. I know that I have been acting out of fear and insecurity, but I want to be able to trust you and be happy for your success. I know that I have been making it difficult for you to trust me and I apologize for that.
I want to make it up to you and I am willing to do whatever it takes to make things right. I want to be able to trust you and be supportive of you. I want to be able to be happy for your success and not be jealous. I want to be able to be understanding and supportive of your decisions.
I am sorry for my jealousy and I hope that you can forgive me. I know that it is not an excuse for my behavior and I want to make it up to you. I want to be able to trust you and be supportive of you.
Sincerely,
[Your Name]