I think, he would only have told me, that I shall not trust in B, that he would hurt ma feelings. In fact, some of the Sempai DID warn me several times, but I didn't listen.
Sensei (the other Sensei) even told me:"B has the potential of a killer, he is a danger, mostly for himself, but also for others. Not on the mat - not at all, but off the mat. I don't want to have this potential of aggression in this dojo. That man is going to get shot out there, if he does not change !"