I'm going to be honest with you.

I'm going to be honest with you.
=I'm going to be straight with you.

                     - I think it was Amy.
To be honest - I'm not good at joging.
                     - you shouldn't doubt people.

Honestly, - I have no idea what I'm doing.
               - I want to become a citizen of Maplewood.

To be frank with you, I enjoyed your sense of humor.

You have job, you are happy. - Look at me, I have nothing!!

You don't know how I feel.