Better investigate and observe him secretly.
Arguing with him or accusing him without evidence will only damage your relationship with him.
小心handle!! Good luck!!!
I thought so too, if it's about work, even if it's "moonlighting" there's no need to hide from his wife.... I feel very hurt when I realize he doesn't tell me everything.
pinky_to:
Will the mobile phone company disclose this kind of info? But I don't think it's very nice to check him behind his back...