Why might a newly married person develop an attraction to someone else who they have known for months?

Without context if you had to make an educated guess

Might have reluctantly married that person
Likely just realized the person is way better looking and has a good personality
Sick of the person they married and they realized the other person is the next most attractive person they know
They might have found the person attractive initially but they got to know the person or something changed with the person like they straightened out, starting be more confident, cool, and the person noticed
Likely just hid it very well, and maybe they want some validation now
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Why might a newly married person develop an attraction to someone else who they have known for months?
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