Wrong for enforcing boundaries...?

TW - Potential Mention of wanting to end it I guess I'm in the wrong for enforcing my boundaries... My partners best friend (please continue reading) envokes physical reactions in me, pressure on my heart, general chest and throat. Theyve done too many things to hurt them and me. Yet my Partner still takes them back every time. Now they made an account together where they document shit and I told my partner "sorry but I'm gonna block your account with them" ans they directly reacted on "oh okay... you could have just ignored it" while yes, theoretically, I could have, but I know myself I will check the account over and over and feel fucking terrible. But to please them I said "fine I unblocked it" and I get returned with "childish"... It went more heated and in the end we stopped texting until I re-text3d them and they were like "my friend friend got a message for you" and they sent a message of how they qre trying for my partner and how I am an idiot and that I should come to my senses and I... I'm now realising once more that I will never be anyone's choice... not even my own partner accepts that I dislike someone

Today a shared friend of mine and him sent me my partners best friends Instagram where it said "imagine letting your partner have friends"... Even when I told my partner that I don't care that they have friends, I care that they are friends with THAT specific person. They always play victim. They make my partner PHYSICALLY SICK from stress. They spread shit about people. They steal his shit. And to the end, they also have a crush on my partner... I'm just... done... I can't do anymore... I just wished to maybe jusr fall asleep, not wake up and have them carry the consequences... I already struggle setting up boundaries... but I guess I'm not allowed to enforce then... or have them in the first place... My partner said I'm the problem... maybe I am... maybe if I'd just disappear people would be happier... maybe his friends were right in not wanting to meet me... that I'm just like all the other bad decisions of my partner...