Do you expect your love letter to be kept private by the recipient?

When you send a love letter disclosing your personal feelings to someone, is it assumed that the recipient of that letter should keep it SECRET and never share it with anyone else?

A friend and I are having this discussion…

He says: You know the risks of sending a love letter when you write it and should feel secure enough with your feelings about that person to not care if others see your letter.

I say: Those are your private feelings that you expect will only be seen by the eyes of the recipient. If that person shows others the letter, they have violated the trust between you two.

Opinions???