I was recently made aware that one of my colleagues has been in a relationship with a sixth form student at the school we teach at and has been so for the last 18 months. She has just left school to do her A Levels, but was obviously still a student when this began. I confronted him about it and he did not deny it. He says he loves her and that it's never been physical (though I'm not sure whether I believe it...). I also know he has cheated on her and has allegedly also kissed her (younger) sister whom he tutors. All I know for sure is that there is a relationship and has been for some time. He says that it will probably end when she goes away to university, however, to make matters worse he has just got a new job in a sixth-form college. I'm not sure how healthy or good that will be as it seems there is a thing for younger girls in his care. What should I do though? I don't know if I can sit on this information so I would like to say something. What's the way of going about this? I don't really want to implicate myself or get too involved, I merely think what he's doing is wrong and that maybe he shouldn't work around teenaged girls. Is it poor form to write an anonymous letter to the school, or his next school? Or is it bad to say anything at all? I could ruin his career, but I feel he jeopardised his career when he started this relationship with her when she was 16. Please help! I'm new to the teaching profession and I'm only going by my gut feeling right now that what he's doing is wrong and needs to be sorted out by professionals and it needs to be investigated. Any advice would be welcomed!