Text messaging all of a sudden was all the time...to her girlfriend! During football games! Also she had a new favorite team who we watched all the time.
Also I NEVER checked detail of cell phone bills!
Finally looked....calls at 2:00 am if answered followed by a call to me...."Honey, I'm a little drunk...I'm staying at Suzies house! OK?" Or "Mary's". As soon as I saw these calls....I knew. As soon as I read a text from her phone.