Is there any idiom in English for a husband who has been betrayed by his wife? (I mean she slept and is occasionally still sleeping with her lover). Or maybe not an idiomatic expression, but just one word that is commonly used for such a person?
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A cuckold is
Edit: This part of the Wikipedia article covers the variations on the 'horn' metaphor (to put the horns on, &c).
If the man is not the father of his children, we might say he has a cuckoo in the nest.
(A cuckoo is a bird that lays its eggs in the nest of another species, and leaves them to raise its chicks.)
Victim of adultery seems to be a common legal term for the spouse who isn't the perpetrator. It is also a popular term in Christian counseling circles.
Or you could just say he is the betrayed.