“It’s not only ok; I think it’s vital not to let people you care about mistreat you. Sinc asdfadsf ”

It's not only ok; I think it's vital not to let people you care about mistreat you. Since you can't really change others, especially an authority figure, backing off from how much you care is the best option. You can build a new family from your friends. Something to think about, are you really right? Your use of the phrase piss off makes me wonder if you've contributed to troubles. Keep some limited contact.