The creep of doubt in the confidence of your relationship, whether the thoughts or concerns are warranted, will erode any intimacy and trust. The emotionally charged arguments will ultimately lead to one or both parties losing faith in each other’s words and actions. A worst-case scenario may lead to a physical confrontation and police involvement.

In order to pass a polygraph examination (lie detector test) you should properly prepare your body and mind. Don't go into it attempting to beat the polygraph. This will likely end in failure.