infidelity
Dara

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You've been married to Dara for a number of years and you're both madly in love and completely faithful, always.
One day, your childhood friend Eric confides in you that he's been diagnosed with a terminal disease; there is no cure, and doctors say he has a few months at most to live. You and Dara are so heartbroken.
During a visit, it's mentioned that Eric has never been on a date, not even once. After a lot of private discussion with Dara, you both mutually decide that Dara should go on a couple of dates with him, out of compassion, before he died. These are just dinner dates at restaurants; Dara would never be unfaithful to you, and your friend Eric would never betray your trust either.
They date 4 times. You're not worried, because you know Eric is weak and about to die. But there's no question that some feelings are developing during these dates. You and Dara aren't worried because of Eric's pending death; you want to show him kindness.
But then, a surprise.