How do I know if my wife's new relationship is a rebound during separation; he is 14 years older than me?

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Is my wife's new relationship is a rebound during separation; he is 18 years older than her and an acquaintance of mine for longer than I have known her, she hasn’t shared it on Facebook and although she hasn’t introduced him to the family, he has been around my kids. He posted a photo of them together but not a single close friend or family member of her has liked the photo? She is 38 I am 42. She is a mother of 4, 2 girls from her first marriage and 2 boys with me. I want to reconcile!!!
How do I know if my wife's new relationship is a rebound during separation; he is 14 years older than me?
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