When does a man usually gain weight during a woman's pregnancy?

When a woman and man are expecting a baby, does the man only gain weight when he and the woman are around each other or does it matter? Can they live away from each other and he still gain weight or no? Just curious

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I know my dad did gain some weight while my mom was pregnant because she would eat more and he ate more so that she would not feel bad for eating more. But I see no reason why a man cannot maintain his weight during his partner's pregnancy.