Defamation Defense? North Carolina

I am an adult helping a family member with their printer. I needed a SD card and they told me to grab one from their desk. I asked if I could format it and they said to back up anything on it first. What turned out to be on it is videos of them cheating on their spouse. I don’t know if the other person in the video knew they were being filmed. If I tell the spouse, I know truth is a defense to defamation or maybe it’s libel or slander? But am I able to share these files since I didn’t film them myself or “own” them or whatever but basically came across them accidentally? Is this some sort of cyber crime? I doubt the person would actually sue but they’re known to yell about suing a lot so who knows.