Word of the day: CUCK
In Chaucer's time, there was the term "cuckolded". Cuckolded means "suffered the indignity of one's spouse being unfaithful", it's spurned, rejected, insulted, betrayed, and unjustly robbed, all rolled into one.
But it specifically refers to marital fidelity. If your spouse is unfaithful to you, you are "cuckolded".
The cuckolded husband watched in horror when he discovered his wife committing adultery with the mailman.
Today the term is abbreviated "cuck" and refers to wimpy, emasculated, "whipped" beta males who are just begging their wives to find a real man, either now or later, due to their own lack of virility and pathetic inadequacy as men. Also, the term implies that if their wives aren't already unfaithful, they are bound to be eventually, due to the husband's aforementioned sissy nature and general inadequacy.
A similar "lame excuse for a man" who isn't married might be called an INCEL, or "involuntary celibate". Such a man might regularly commit sɛҳuąƖ sins of thought, word and deed, but always alone. He is celibate (unmarried) but such celibacy is completely against his will. His intentions with women might be completely base, and he might regularly try to "score" and achieve one night stands, but no woman will give him the time of day.