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>This isn't about hiding HER, it's about him being dishonorable. He wants the sex and the cooking and half the rent paid, but he doesn't want to upset his parents. That is, he wants to disobey them but he wants to appear as if he's not.<
Agreed--this is an old, old story. In old-fashioned terms, LW is good enough to be his "back-street" woman, but not good enough even to acknowledge he's living with her, much less marry. If he can't stand up to his parents on this, he never will, so she's better off getting out while the getting's good.