AITA for making a small argument with my boyfriend's friend a big deal in our relationship?

Hi Reddit! I recently had a dumb and childish fight with one of my bf's best friends which devolved into me blocking and cutting all contact with his friend. While yes i mainly have an issue with his friend not him, he not once put a stop to the constant pushing and barrage of texts trying to "prove" his point until i also got mad at my boyfriend for saying he was "staying out of it" i did not start the argument and i kept getting riled back up by this person every time i tried going silent and ignoring it like my boyfriend tried suggesting. This has happened several times now and I'm tired of my boyfriend "taking my side" when it affects our relationship instead of just remaining neutral like he so desperately wants and telling his friend it's time to stop. AITA For telling him not to come see me all week and cutting our hangout short refusing to talk to him about it any further?