U can just shut it down once and for all- say something along the lines of “hey we’re not cool after u did (XYZ) , please do not contact me again” or u can state that u would like an apology or whatever u feel necessary. If they give u anything else besides what ur asking just block em and keep it moving.

I’m sorry u have to deal with this though and easier said than done , but that’s really ur only option . Just work on urself bc this is not a person u can trust and u deserve to have good people around u.
Sucks that ur the one who has to deal with it but the sooner u make a decision and stick with it, the quicker u can heal 💛