I'm usually very open with my SO, don't keep anything from him. Since he's away in China for the week, I call his mom everyday to check up and make sure she's doing well. Last night she decides to drop a bomb on me and tells me to promise not to tell her son while he's gone. She told me she'd never speak to me again and that she'd never forgive me. Now...it's nothing life threatening and her points are valid as to why she doesn't want him to know BUT, I feel that since he's her only child and a HUGE mama's boy...I should tell him...what do I do??