Anyone who watches those TV shows where they give the boyfriend a lie detector test in order to discover if he is cheating will recognize some of the repetitive cries of the anguished girlfriend:

• "He hangs up the phone when I walk into the room"
• "He goes into another room to talk"
• "I found text messages on his phone"
• "He has been ringing a strange cell phone number"

These cheaters seem to have a repetitive arsenal of answers when confronted with these suspicions.

• "I was talking to my friend "Joe"'
• "The text messages were only a joke"
• "I am talking about work and need to have privacy"

While all this can seem entertaining when it is happening to someone else, when you are the one who has a boyfriend engaging in such suspicious activity suddenly it is not so amusing.
It has led many women to the depths of depression, ruined relationships, and torn apart families.
Taking Action Apart from going onto a TV talk show and voicing your intimate details for the pleasure of others, there are some private steps that can be taken to investigate your suspicions, without having to resort to an expensive private investigator.
You need to find the number that you boyfriend has been making calls to.
This will be recorded on the call history of his phone, or on his phone records.
Once you have the number that he has been phoning, if it is a residential number, you can do a reverse phone lookup on White Pages which will give you the name and address of who he is phoning.
If it is a cell phone number that he is phoning, which is the most likely, you will not be able to use White Pages.
All is not lost however, as you can use a cell phone lookup service for a small fee and find the information you are looking for.