If we are not willing to confess our faults to each other, we inevitably finish up confessing each others faults (either “you did this or that,” or “Do you know what he/she said /did.”). Believe me (I think you will) this is not so healing.
Modern research into such things as conflict resolution, and the discovery of what and how intimacy works, has discovered the Biblical principle at the head of this post. It phrases it differently but it's the same thing. Openness and transparency and the willingness to take responsibility for our poor choices promotes bonding and intimacy. Is is any coincidence that principles that work in the study of human behaviour, all seem to reflect Biblical promises/principles? I don't believe it is. If all else fails read the (God's) instructions!