I think that we all have those moments where we are struggling to cope in healthy ways but you tried to use other coping methods before you slipped up. I think we are also our harshest critics and it is ok but try not to focus on those guilty thoughts I find that when I do it keeps me stuck in a place I don't want to be. When I am upset I try holding ice because really cold things has a way of slowing our brains down and giving us time to think of our options. Now about the boyfriend I think that if it is obvious that it was self inflicted it may just be best to explain it to him and if he is someone worth it he will try to be supportive.