What Kate is doing isn’t wrong. Would I do this, no, but she’s a consenting adult and this a way for her to make money to probably help pay for school. There is no reason to “out Kate” to anyone. It’s her private business and you have no business exposing her. She has done nothing to you or your marriage. With that being said, ~~your husband is the one in the wrong. He is cheating on you via the internet. He is speaking with another woman and is paying for services he is keeping secret from you. It is also somewhat disgusting since this is someone you both know and he was her teacher (an authoritative figure so to speak). Teachers and students have boundaries. If you out your husband, he can lose his job.~~ You need to decide if this is forgivable. Kate probably doesn’t know its your husband she is conversing with but that is the risk she takes when doing her webcam job. And maybe she wouldn’t care. Your husband is cheating.

FTFY