NAH. The only thing about this that would give me pause is that she would “lose her mind” about it. If my husband wanted to do a paternity test on one of our kids, I would probably think it was hilarious, but beyond that, I would offer cooperation with whatever he needed to feel reassured about whatever gave him the impression that I might have been unfaithful, because I have nothing to hide. I would be very CONCERNED about what had gone awry to lead him to believe that this was a possibility, but I would assume that maybe he was suddenly experiencing mental health issues or reliving past trauma, or whatever, but it’s not like his need for reassurance suddenly makes me guilty or in the wrong, so why not?