This answer is like two sides of a coin meaning a yes and a no answer however most people could witness unspoken truth about your personality through actions or your habits, beliefs, the way you dress, not including being intoxicated with alchahol, drugs, or anti depressents. You do not have to get into a fight with your husband/boyfriend or wife/girlfriend in order to tell the truth though it may seem hard at times and often people lie about their personal feelings or are not willing to share them.
For example- Sometimes because people wear something on the outside does not always mean they feel that way on the inside. Think about a wolf in sheep's clothing. To follow another belief or something that you do not believe in makes a person vain but people could think you are following their belief or common appropriate behaviors. As far as boyfriend and girlfriend relationships are, I am usually honest unless it is something that should be kept secret or unspoken. The truth can also be expressed on a person's facial expression.
This is just a brief explination clarifying to you and I that people can tell the unspoken truth without being in a fight or intoxicated during relationships with other people. For more information on relationships though, you may want to ask an expert. I am just a seventeen year old boy.
-Some random Guy-