NO RELATIONSHIP can withstand lies. Sometimes the liar does it out of fear. Fear is a great generator of lies. Any lie is a character flaw, but fear makes it even worse.
Therefore, to stop lying, the partner must first confront their fears and overcome them. The problem is that many couples do not cultivate an environment within the relationship where the truth can be spoken freely. Moreover, those who lie must learn to be honest with themselves in the first place: and recognize what they fear.
The good news is that, with the right support (like the one couples receive in the Love Therapy – https://lovetalkshow.tv) this can be overcome.