Sex File: I fantasise that other women fancy him but have no desire for an open marriage

You both acknowledge that you have fleeting crushes on other people and maybe these fantasies are your way of exploring what might happen if one of these was reciprocated

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My husband and I have been married for years and have no problem with each other having random crushes, but recently I've been fantasising about other women fancying him. 

I hate the thought of him being with another woman in real life, and I have no desire to open up our marriage, so what might this mean?