She Said She Was Her Uncle….

When we were dating, this girl introduced a certain man to me as her uncle. They went on trips together and I didn’t have any problem with it. We invited him to our wedding; he came with a huge sum of money and gifts. After the wedding, she often visited this 'uncle' and sometimes even stayed overnight. I didn’t understand, so I confronted her best friend, who showed me evidence proving that the man was not my wife’s uncle but her “sugar daddy”. Since then, I haven't been okay. I want to file for a divorce, but I don’t want her to know that it was her best friend who told me