Two things, when you ask him a question he will answer you with the question. He will have a hard time looking at you while talking, and sometimes when someone is lying, questioning him will make him annoyed or upset for no reason.
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If you suspect your husband is lying, look for signs like inconsistency in his stories, avoidance of eye contact, defensive behavior, or changes in body language. Clear communication and an open conversation can help address your concerns and improve trust in the relationship. If needed, seeking support from a therapist or counselor can also be beneficial.