You've been teaching successfully at this school for three years and you're an established teacher. You seem to have an insecure NQT, not the end of the world. However your head seems worryingly bad at managing people - must have been on the standard 'how to be a rubbish manager' course that so many heads excel on. The head's poor skills make the situation potentially dangerous for you. If your head immediately reacts to one side of a tale by deciding it must be the truth, then things are worrying. If you are being accused of something unprofessional, then this should be done correctly, with all sides given equal air time. The next steps are pretty much up to you. You might leave things as they are. They might go away. or they might get worse - and this means further down the line anyone could say 'it must be true because it wasn't denied at first' privately ask your head to clarify what you are accused of doing, and insist on giving your side, then leave her/him to mull it over have a talk with your union rep. The NQTs actions as you describe them could be deemed harassment - bullies aren't always your manager at work. Ask for advice about how to handle this accusation. Ask not to be partnered with the NQT - this might be a good idea in any case, as you describe not feeling experienced enough to mentor. be cautious and limit your trust to people who are worth it. Going behind your back to complain to your head about you doesn't strike me as trustworthy behaviour, so if you are asked to 'sit down and talk', ensure this is done in the presence of someone else who you trust.