Duets that have a similar meaning to the song Does He Love You by Reba?
What Girls & Guys Said01
It's not a duet but the only thing that comes to mind is also by Reba, from the wife's perspective, called "Whoever's in New England."
There's also an old Noel Coward song, covered by the Pet Shop Boys, called "I'm in Love with a Married Man," which is very poignant. Similar theme, but normally performed by a gay male artist.
Can't think of any songs written from the other woman's perspective, other than the one in your question.
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