A healthy relationship is an interdependent one, a partnership, an alliance - no healthy parntership can take place if trust is violated. If one partner is lying and betraying the other there is no way that can be a healthy or functional relationship (it might be functional in a have-my-cake-and-eat-it-too kind of way in the short run for the betrayer partner, as long as the other partner tries to pretend it is not happening - but in the long run it is not functional for either because any betrayal is ultimately a betrayal of Self - which will be paid for sometime, somehow.)
In order to violate trust in an emotionally intimate relationship it is necessary for the betrayer to be emotionally dishonest with themselves, to have little self-respect or True self-esteem, have a capacity to lie, rationalize, and blame (that is redundant since rationalization and blame are lies - the betrayer always blames the person betrayed because the only way to live with themself is to convince themself that it is the other person's fault.) A person makes a very sad statement about themselves when they do such a thing - they are Truly a lost and wounded soul.
