Bad manager on board, should I jump ship?

Okay so let me say I love my job and the work we do, it is unique and to do a similar job somewhere else I would have to move to another state. But a manager and I had a bad run in a few years ago. Long story short, he sabotoged my team and was setting me up to take the fall for his bad work, I protected myself by collecting evidence that it was his doing and reflected the blme back on him. so We both got blamed, even though I had no power to stop him. Now he is still in the office and he hates my guts. I do not talk about him, and never have to others in the office, but he has trashed talked bout me to many people. Even to go as far to tell people that I think I am better than them because I dress nice instead of doing business casual. Truth is I do not have any business casual clothes nor the budget to have several sets of wardrobes like him. I do not know how to discredit this guy or if I even can, he is well liked, I liked him a lot, he was my mentor before he stabbed me in the back. I feel like I need to warn people about him, but they would never believe me. Its kinda like you know your best friend boyfriend is cheating on her, but you cannot tell her because you know she would take his side. I don't know if I should cut my losses and leave or try to fight the good fight, if fighting is even possible. Any advice would be appreciated.