should i leave my toxic friendship group?

hi im a 13 year old girl and i have been having trouble deciding if i should leave my friendship group, this story might take a while but can someone please help me out. I have quite a big friendship group mainly boys and around 6 other girls, most of the girls im best friends with and i love them except one of them, this girl joined our friendship group later than all the other girls, around september time and my group started in june. This girl is really close with all the boys and most of the time picks them over us which i dont mind but i care when it gets to the way the boys act. Around a month ago, in lockdown the boys in my group started calling me attention seeking and told me to k!ll myself and one of them made a groupchat called ' (my name) kys'. My older sister got involved and made them all call me and apologise and since then 2 of the boys that were involved have changed for the better so much but 2 of them on the other hand havent. The boy that made the group chat's mum found out and she told him off or whatever but hes only getting worse and says 'oh are you gunna get your sister involved'. Theres 2 boys in my group who are the worse, one of which involved with my sister telling them to apologise and the other not, the one not involved is the worse he tells me daily to 'k!ll myself' and says 'let me look at your wrists oh there not slit enough' also whenever im having a normal conversation with him he just says shut your mouth. Ill reply to this and finish it