Re: cell phone. Yeah, it hurts. A secret phone. My H had one too, remember?
I'm on the other end now, so let me tell you this. It's NOTHING. She means nothing. Again, it's b/c he's scared of you. No excuse, but it means nothing.
My H told me this...he threw it out, hated it, wanted it rid from his life, and wanted to stop the madness. Your H will too.
OW, the phone, all if it is just a salve...sooner or later H will turn around and see how unsatisfying it all is b/c it's 'wrong' and can't last.