Whose phone number is this?

The first 6 years were not perfect, but they were perfect for me.  We laughed together, cried together, and were best friends.  We loved hard and, unfortunately, we fought hard, too.  But we always made up.  And we read the bible together.  We were both determined that this relationship was going to go the distance.  And I believed it.  We traveled to many places.  Had wonderful vacations.  We even bought our dream house together.  It was in a picturesque neighborhood, 3500 sq ft, and gorgeous.  From the outside looking in, we had the perfect life.  Then I had to have a minor surgery that had me out of work for about a month.  John would call me as soon as he got off work.  Until one day he was 15 minutes late calling me.  I thought that was odd, but his explanation seemed realistic, and I had no reason in the world to doubt it.  He came home and left his cell phone on the kitchen counter and took a nap.  I was cleaning the kitchen and noticed he didn't have his phone plugged in to charge.  I plugged it in, and it lit up, showing his recent calls.  Come to find out, his explanation for calling me late didn't add up.  Turns out he had a 37 minute conversation with someone before he called me.  Someone whose phone number I didn't recognize....hmmmmm...Now I'm wondering.  I looked it up in the phone book, unlisted.  I paid $9.95 to an online company for a "reverse lookup" of the number.  Turns out it was someone we worked with.  Someone I had NO REASON to think could EVER in a MILLION YEARS come between us.  After all, she was married, too, she worked on our shift with both of us, and she could see, just like everyone else how happy we were.  There was NO WAY this was anything fishy.  I asked him about it.  He told me he talked to her about someone else, and he didn't tell me because he knew I would "get mad."  Ok, again, no reason to doubt.  Then the many lies began..........