True. Revenge will hurt you more than the other person. By letting go of those who hurt you you're not only setting yourself free but you're respecting yourself by removing those toxic people from your life.
No ! Just because they treat you like a shit doesn't mean you have to put energy on the same game they're playing showing you' re not as different as they are, don't do that ! People of that kind are just building their way to a place maybe you can build too, but you really wanna be part of that? Is useless