lolawar,
From what I have read, if childhood issues then they MLC. I never cheated either. 2nd,3rd marriages because if in MLC they marry another alien and when they take off their masks, they implode.
They never found the way back from the mothership. If they can face
themselves, from what I can understand, they can break free of its grip. Which leaves the other one left to look for another alien and
rinse and repeat.