Crumpet..... don't give people too much credit, even in your own words you say this is a "warning".....about what? Is it a warning or friendly emails? Have you been through such an experience? I have and did try to give "the benefit of the dout", didn't work. Those of us who have had this experience may be a bit more cynical, but we know chapter and verse about the signs of cheating or things that will lead to it.
In talking to my therapist within 5 minutes she knew what was going on in my situation, not wanting to believe her I didn't take her advise, but in the end she nailed it. Same with my Attorney they see this stuff everyday its the same story chapter and verse, just a different name.