OP here. Just to clarify: - I found out about the texts a month or so ago when she sent one just as we were cuddling in bed. That was fun. - Husband had not responded to her texts the way she would like, but he hadn't exactly told her to fuck off either. He just kept bleating on about how they were supposed to be friends. Ostensibly it's because they worked together (we all work for an IT company but they were in a different department) and he didn't want to cause trouble but I think it's more that he quite liked the attention. He is well and truly in the doghouse. - She is well aware of our marriage and had met me several times prior to sexting my husband.