Can you get ahold of her phone and find a name to the number. Snooping is not the best thing to do, but if something is happening behind your back, you have a right to know. The more info about this OP, the better you can confront on. She does not need to know how you got your info. What about email records, chat sessions, texts, call the number yourself from a payphone, get a name? Just some ideas. Have you thought about a keylogger on the home computer. Shock
