how do i end a frienship

TLDR; do i tell mallory that i am ending the friendship or how do i tell Mallory i don’t want to be friends with her anymore? im super tore up about it.

i (f 24) I have always struggled to make friends, when I started at my current job this girl, will call her Mallory, was really nice and very welcoming at the store. I started at the same time around this other girl will call her Jessica. Mallory was a manager of some sort it was also engaged to a another manager at the store (they are both the same level) and her and Jessica got really close a little too close if you know what I mean.

I knew about Mallory, and her fiancé AND Jessica and a few other people did too. I just minded my own business cause I didn’t know what else to do eventually, I was getting told about Jessica and a different friend at the store. stuff that I didn’t want to know that Mallory was telling me, eventually, Jessica, Mallory, and the fiancé broke up and it was a super messy, and this relationship started to leak into the work environment and Mallory started telling me a lot of stuff that I personally don’t think is true, just a lot of gossip that was told to me out of nowhere and not just about Jessica and the other friend about other people at this store. Jessica ended up quitting because Mallory and her fiancé were not very nice to Jessica. The whole relationship lasted about 9 months, when Jessica quit, that’s when it ALL came out at the store. I ended up getting interviewed as as well as some other people Mallory and her fiancé got fired. during all of this Mallory and her fiancé were planning a wedding that they made me RSVP too when they got fired. I haven’t texted Mallory at all. She’s been texting me, but I have not been replying. This is where I need help.

literally, I wanna say two days before I got interviewed by my job for the internal investigation, my boyfriend invited mallory and her fiancé for dinner and we played some games. I honestly don’t know what to do. I don’t know what to think. I just want the stuff to be done and over with. I don’t wanna talk about it anymore. I feel very drained talking about it and I feel like the best course of action is to cut off Mallory and honestly maybe cut off Jessica as well. I’ve been asking people for advice on how to cut off Mallory a lot of people are saying, just don’t reply to her, but I kind of want to at least give somewhat of an explanation on why I don’t wanna be friends with her anymore and she took me off the list for people coming to her wedding cause I never texted her back or changed my RSVP.

I don’t have a problem with people being a throuple that’s not why I don’t wanna be friends with them anymore. It’s how they approached the whole situation and I almost feel like they preyed on Jessica with her whole situation going on with herself. Plus they were 10 and 20 years older than her. (we are all legal adults working at this store btw)

my question is: do i text mallory an explanation on why I don’t wanna be friends with her anymore or do I just leave it alone?