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Leaving every woman he's ever been with, every one that isn't stuck with him in the Brimstone Dimension that is, is not a symptom of flightiness and selfishness…well, not entirely. It's also a function of needing to keep himself aloof, prevent any affection growing between his heart and a mortal's, because he will outlive them, their lives snuffing out in the time it takes him to turn around, seemingly. Seeing a beautiful woman fade and desiccate, wear away, worn out by merciless time, is demoralising, causing him more than ever to want to throw himself into mind numbing hedonism.