When a man loves a woman, he does not give himself, but takes her. When a woman loves a man she gives herself utterly. Utterly? Yet there is one small thing she will never submit - her enjoyment! Thus she keeps for herself what she really values, and gives what is not important to her. His gain is therefore hollow, as she has given nothing. He has been duped, for she has given him sand dressed up as gold. But then . . . she never did promise him anything.
What is more, it is not so much the man that she loves, but the Man that he reminds her of. So she loves another, not a physical man but an imaginary one. And there are many who remind her of Him. Therefore the man in love is eternally cuckolded. He looks after another man's woman, in the naive belief that she is his.
Men too are unfaithful, but I do not need to tell you that.