Honestly it’s up to you, also you don’t owe people kindness but you should treat them with basic respect, anything beyond that is up to you and well, why you should do it? Because people treated you badly and you want to do better than them, if that doesn’t align think of something else or stop, just please don’t treat people bad just because you’ve been mistreated, I know it hurts but it’ll be okay, I promise, the new people have nothing to do with the ones in the past and they deserve a clean slate