Sorry for double posting but I have to get this out as well

I am not going to tell anyone about the affair or sex when separated other than everyone on here.

Here is where my concern comes in. She is going to see this guy when he comes into buy parts from her. And she is scared that if her boss finds out she had sex with a customer she will be fired. And I can understand her fear of that because its her only income now that we are separated. But how do I deal with the fact if we get back together, she is going to see him?