I am sorry to make you confused. Actually I do not have anything important to do. I just want to say that you make me happy every time I read your letter.
I'm sorry that makes you confused, in fact I do not have anything important at all. I just wanted to say that you made me happy every time you have to read your letter.
I'm sorry that makes you confused, actually I do not have anything important, I just wanted to tell you that you make me happy every time I have read your letter.