I have many numbers in my cell phone that keep appearing ... one of them belongs to an attractive female coworker (an officer) ... since she is a coworker, and I have occasion to call her at least twice each day in the course of work, her number will show up with some frequency. A frequent number does not represent an affair. What it MIGHT represent if the calls are at odd hours (after work) is that she is getting some companionship that she should be getting from home. It might just be talk. Now, if she is going out at odd hours and staying out late, you can draw your own conclusions.
If the trust is gone, it's time to get a divorce. The fact that you are even suspecting her seems to indicate that this marriage needs to enter some serious counseling to save it.
- Carl