The best thing to do is let them go.Never be friends with people who are toxic,and cause negativity in your life.Don't be best friends,or in a relationship with them, because it is very hard to deal with people like that!Or,if you already are best friends,or in a relationship,let me say something. One:The blame is on you the whole time,isn't it?
Two:So,imagine you are having a fight with them.You say what you think,and they,of course,don't agree.The best thing to do,is to agreement.You need to pretend to agree with them,and act as if you were really the one that is wrong,and ''apologize''.Say something like:,,I now know,how bad I really am for you,so let's just not be best friends/in a relationship anymore.I'm really sorry that you had to deal with a bad person like me,and I really hope that you will find a better person for yourself.Sorry for everything i've done,and I really,really hope that you will find someone that is perfect for you''.This might sound wrong,but it may help you.
Three:So,if the previous one worked,bravo!And if it didn't,get ready to do one of the hardest things in life:Let go.So,you need to avoid contact with them,and maybe even block them on social media.They will surely say:,,Why are you ignoring me?I'm your bff/boyfriend/girlfriend!''And what you need to say is something like:,,Well,I'vebeen thinking for a while,and I think that I am not the right person for you.I've done some really bad mistakes,and I wanted to say:I'm very sorry,and I think you really deserve a better person than me,and should see other people''
Four:They might want to come back to you,and what you need to do,is act normal,but don't act as if you were vlose.Act like your just friends.Or if you don't want to be friends with them,ignore them,and avoid being in the same friend group as them,because it will be more difficult.If the friend group they are in are your only friends,try finding other friends that might be right for you.And,if it's hard for you to find other friends,don't worry,you will find other people,there are 7 billion people in the world.
And that's it!I hope this helped,and if it didn't,don't worry,:Everything ends good.If it's not good,it's not the end!