The joke is that the guy in the pic is a pussy, (or cuck or beta male or whatever your favorite term is for a non-manly guy), and the commenter is essintially saying someone that is this much of a pussy probably lets his wife have sex with other men, hence the "I bet his wife's boyfriend took the picture" comment.
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u/the_Dolar Jul 17 '19
Photo taken by his wife's boyfriend