Emotionally immature people may seem to be emotional manipulators, but actually they’re just very opportunistic tacticians pressing for whatever feels best at the time. They have no investment in being consistent so they say whatever gives them an edge in the moment. They may be capable of strategic thinking in their work or in other pursuits, but when it comes to emotional situations they go for the immediate advantage. Lying is a perfect example of a momentary win that feels good but is destructive to a relationship in the long run.
Gibson, Lindsay C. Adult Children of Emotionally Immature Parents. ch. 4, 33:14 – 34:02