The LoveInterest has noted something odd about her partner. He is gone at all hours, does strange things and never answers a straight question. Is he betraying her?

Never fear! Your love interest still has UndyingLoyalty toward you and would never do such a thing. No, it is something else. Rather he is a great patriot bravely defending his country against TheEmpire. She, of course, can't be told about this because she has no need to know. So she must wonder.

Not necessarily a married couple, of course. Subtrope of MistakenForCheating.
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!!Examples:

[[foldercontrol]]

[[folder: Film ]]

* The plot of ''Film/TrueLies'' is an [[InvertedTrope inverted]] example. Spy and counter-terrorist agent Harry Tasker thinks his wife Helen is cheating on him, though she doesn't seem to suspect him of anything other than being a boring salesman.
* Not spies, but close enough: ''MrAndMrsSmith''
* ''WesternAnimation/TheIncredibles'': Mrs. Incredible gets suspicious when she finds a tear in her husband's old costume (and in the outtakes, what she thinks is AffairHair on his suit).
* In ''Film/HeadOverHeels'', Amanda and her friends are suspicious of Amanda's new boyfriend Jim. When they investigate, the evidence leads them to believe that he is a violent criminal. He's actually an undercover officer.
* Justified in ''The Assignment'' (1997). An American naval officer who happens to be the {{doppelganger}} of terrorist Carlos the Jackal is roped into an intelligence operation. Part of the operation involves sleeping with Carlos' ex-girlfriend. His wife realizes something is wrong because he's [[BecomingTheMask suddenly changed his sexual technique]].

[[/folder]]

[[folder: Literature ]]

* ''Literature/TheScarletPimpernel''.

[[/folder]]

[[folder: Live Action TV ]]

* In the ''Series/{{NCIS}}'' episode "Power Down," a young man discovers that his recently murdered wife, who he momentarily thought was cheating, was a security agent working to protect TheGovernment against cyberattacks.
* A subplot arc in the first season of ''Series/{{Spooks}}'' involved the girlfriend of one of the agents adding two and two together to get five. (The time the agent went undercover as a married man and then forgot to take the ring off before he went home really didn't help.)
* Spy's Suspicious Daughter in ''Series/TheAmericans''. Paige, the teenage daughter of two Soviet deep cover agents masquerading as Americans, grows suspicious of her parents in Season 2 and starts snooping.
* Mary Woodhull, Abraham's wife in ''{{Series/Turn}}''.
* Not a spy, exactly, but ''{{Bones}}'' once had a victim who turned out to be separated from her husband because she (and her sister, who also suspected him of the murder) thought he was cheating. It turned out he was sneaking out and spending time at a sleazy motel to meet a legal contact because he was testifying in a major federal case.

[[/folder]]

[[folder: Truth In Television ]]

* This is a RealLife danger of the espionage profession.
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