I think the biggest mistake I made, once I realized that my last partner was a mythomaniac, was to underestimate the amount of damage this person could do to me.
So I urge you to act with caution.
Don't expect the courts or psychologists to take your side. It can be very difficult to evaluate these situations from the outside because the mythomaniac is skilled in making other people look and act 'sick'. In my case, I became very ill and ended up in a paranoid psychosis, hospitalized.