Answer
There's no definite way unless you catch that person, but you can always hire a Private Detective if you really want to know for sure. If you can't afford a PD, then maybe a distant friend who your spouse doesn't know and have that person followed, other than that, I don't see how you would know.
Good luck
pray and ask GOD to reveal it to you if there being unfaithful and he'll show you signs and proof.
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