Cheater or Not

Question: Katie and Ben have been having problems but nothing any marriedcouple cant handle.One day while going through monthly statements katie finds charges for stores ie victoria secret and charges from resteraunts and plays where she knows she or here husband really dont usually go.Then she finds a matchbok from a ...resteraunte from one of the charges and a receite.When she asks ben he says hes never been and must be a mistake ..Who and what does she believe????