Jay - I agree there is no way your W can continue to work for this guy. IMO that would be a strict boundary.
Sandi - what would you recommend in the W and OM work together (peers) in large company? They are forced to interact occasionally, have work outings (occasionally), and an annual overnight conference. My thought is that if the W really has remorse and wants to save the M she would be willing to look for a new job in order to avoid all contact.
Jay bob's last post was in August. I'm guessing he's got it all figured out and doesn't need this board ;-). Should have noticed the date before I bothered replying!
EA can and do turn into PA's. It may already be a PA.
This being her boss is extremely inappropriate.
Contact her HR and notify them of the situation. Save those text messages as evidence. Contact her boss's wife if you can get that info. Your wife needs to leave this company and get away from the perp.
Stop this behavior from going down a dark road. Take action now.