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Another poster wrote that the BF is conflicted because it has been drummed into him that he must please his parents, but he "loves" this woman and doesn't want to lose her.
I would disagree with this. To me, love is what is wanting what is best for one's partner. Love is putting her best interest and dignity above one's own desires. By hiding this woman and refusing to treat her with dignity and respect, he is showing that he does not love her, but probably just enjoys the free sex, domestic support, and companionship.
Love is not what we feel, it is what we do.