You are absolutely right that if you want the chance to discuss this with him, you must be allowed that. Resolution conflict has to involve all parties, especially the "victim" - although I hate that word. If your school has restorative practices, you must be involved; how can anything be "restored" or "resolved" with you out of the room? Excluding you from the process merely reinforces your position as a passive “victim”, unable to take control of the situation. That can only be a negative perception for your future dealings with the boy, who will continue to see you as an object. Approach your SLT once more. Say that you do not feel that any resolution has taken place because you have not been included. Request in the most assertive terms possible that a conflict resolution meeting be set up between you and the boy, chaired by a highly qualified resolution conflict manager who will discuss the issues with you beforehand and help you through the process. There may be reasons why they have not done so: one that springs to mind is that this behaviour is so marked that it may be the symptom of some serious underlying abuse or trauma, and such a meeting may ultimately be damaging to the child. But that is speculation. You have a right to know why you are not involved in any resolution management process - if there are such underlying reasons, then you also have a right to know what support is going to be put in place for you in place of that resolution management, such as exclusion.