I have been in many support and therapy groups some of which were for self injury and the one thing I learned in them is that everyone has their own reasons for cutting and some choose to disclose why and others don't. and I know that when someone does not disclose to me why, that does not mean they don't have a reason. people don't just wake up one day and starts hacking away at their self without a reason and I personally don't worry about it when someone doesn't tell me why for each person has their own reason and cutting at least for me has always been a private thing that I don't discuss because I have been hospitalized for it and I don't make the same mistake of talking about it twice. So I don't worry about it when others don't tell me why.