I'm Being Put In The Position Of Covering Up Affair

I am the bookkeeper for a small family business. I've noticed checks, credit card charges made for rent and furnishings for a young lady's apartment who works here. Looking back to when she started there are many credit card bills for restaurants near her apartment. There are also clothes, shoes, and a trip yo her home town. I confronted the owner, he was non plussed and said she was a nice young girl and if he could help her he would.

I started randomly going over to her apartment. The owners Cadillac has been there several times, late at night. I have also witnessed her going out with him. I have no question that they are in an affair.

I felt I needed to let his wife know. She was upset that I was snooping, basically she told me to mind my own business. I lost my temper and she told me thank you, but MYOB.

I want to quit my job, he is having an affair and his wife doesn't want to know about it. I can't leave without another job. It is sickening that when his wife comes by the first person she talks to is that girl. I went back and recorded all the charges and checks that benefits her as personal expenses. He will fire me when he finds out.