Is my wife cheating or on the road to?

She likes to walk behind my back. Yesterday I caught her glimpsing through the driver's window of a luxurious car while we were passing by. She looked at it in a secret way and that's what caught my attention. Her eye ball were at the corner right while her face was almost in straight forward position and generally just behaved suspicious
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On a first note, she felt tense while approaching the car
Is my wife cheating or on the road to?
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