I have just come out of a similar situation here in the UK. I’ve always been dedicated hard working confident and able to deliver. Never had issues with my managers in 30 years of work. Then a new manager starts and he takes a dislike to me. Over the course of a year he changes me into a shadow if my formal self where I can’t make a simple decision, always finding the negative, never being positive, undermining me with my team and basically almost destroying my belief in myself. I stayed and tried to sort it out by being my usual committed self. It did my health no good. It’s time to look for a new job. You can say if you are asked why you are leaving that you would love just to have a change, widen your experiences, do something different. You don’t have to disclose ‘the truth’ and honestly most people wouldn’t.  Trust your own instincts, depend and get support from your friends and family and tinybuddah and never lose faith in yourself. Normally when someone behaves poorly it’s because they feel threatened by your abilities and are trying to protect their own vulnerabilities. Hope that helps. Stay strong.