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The effect of Celexa upon libido is unpredictable, but your sex drive may be only temporarily reduced. For me, at first, Celexa caused reduction of sexual sensation and delayed ejaculation, but my wife was understanding about it, and those symptoms have gradually subsided, and my libido is fine.
In time, you may find that your libido has not left you. Perhaps, instead, you will discover what your letter already implies: that you are simply no longer feeling desperate dependence on your wife for sex that you never really enjoyed in the first place. In other words, perhaps it's not your libido that has fled, but your self-respect that has returned.