How does a man (married) feel when his much younger, ex lover (ex affair partner) gets married and he’s stuck in unhappy marriage cuz of kids?

Does he miss her? Will he ruin her marriage? Age difference is 12 years. He got busted texting her by his wife and was forced to cut contact.

How does a man (married) feel when his much younger, ex lover (ex affair partner) gets married and he’s stuck in unhappy marriage cuz of kids?
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