I was told my friend cheated on her husband but I’m unsure if I should tell him as he’s devoted to her

DEAR DEIDRE: SHOULD I tell my best friend’s husband that she is cheating on him? We all work for the same supermarket but she’s in a different branch to her husband and me. We’ve known each for about 13 years and our kids went to the same school. This man is devoted to her. I...