Honesty
Honesty is one of the most difficult to achieve for life.. Zero score for lying???... I`m guilty here! I lied a so many times, but most of them, are excuses and alibis for me to do what I want. (hehehe) But not intended to hurt someone or to hide crime.
In a relationship, honesty are valued very well. As one Unknown quoted, "A lie may take care of the present, but it has no future." So true, you can hide it for a moment but not forever. It`s much better to tell the truth than to make it believe on one false story. So to take care the trust that was given because once it was betrayed you may lost it all forever.
Say sorry, make sure you mean it, don`t make promise... just do it :)