Dealing with losing a good friend?

I’ve never really lost anyone close to me from a thing, I’ve always just grown apart from people...

I had this really good friend and we were super close. We started working together at a job with a bunch of our other friends because they were a new store that opened and they needed people! Everybody says it is a BAD idea to be working with all of your friends at a job and I can see why... I got promoted shift lead and so did this other girl in our friend group. I didn’t think it would cause any issues until this week. Basically, I was joking around with my manager because they still haven’t given everyone their cash register codes and people are using other people’s . I only brought this up because it was annoying that only a couple of people could do register because of the code thing and it was really inconvenient especially because my boss and manager has everyone’s codes but just keep forgetting to give it to them. Anyway, other people are using mine. I didn’t name any names because I don’t think it’s a huge deal but AS A JOKE I said if anyone steals it’s not me! I know it wasn’t a good joke and I regret saying that because it caused some problems. Keep in mind, I said this out loud with my other coworkers who happened to be 2 friends from the friend group. I really didnt think much of it at that moment and had forgotten that I said it. 2 days later, my good friend asks to talk and I was really confused because I really couldn’t think of something I did wrong. We talk and then she says that she heard I was telling my manager that I think she’s going to steal... I was SHOCKED first of all... WHAT? If I genuinely thought my GOOD & CLOSE friend was going to steal they wouldn’t even be considered a good friend to me in the first place AND why would I openly out loud be like THIS PERSON(her name) IS USING MY CODE AND IF SHE STEALS ITS NOT ME like what?? Not to mention that I would’ve pulled my manager to the side and talked to her privately if I really thought this was a concern they should worry about?? That’s not even what happened so I explained to her why I even said steal in the first place and because it was a joke. I told her I wasn’t pin pointing her and that it’s not just her using my code?? So I’m not pointing fingers or being sus about anybody doing anything shady with my code??? I wish I had explained the context to her more because my manager was also talking about how people use her code as well so it really wasn’t me bringing it up to get people in trouble?? Idk but anyway she was like oh okay I’m glad we talked to clear things up but then she also said that she felt like there was a power shift with me being promoted and that I was mean when I told people to do things. So I was like okay thank u for telling me I’ll work on my tone because I really don’t mean to sound mean or rude or anything like that. And I always Get anxious when I tell people to do things because it’s out of comfort zone and am scared how people react. Everything just went weird after this because I know she doesn’t completely buy my explanation because my 2 other “friends” (who I am hella ANNOYED at for starting drama where there is none) will be talking shit about me and invalidating things I say because that’s what they do. I’ve witnessed them do this to other people. Anyway I had a group chat with them and today I found on IG that a customer posted a picture of them and I screenshotted and sent it to the group chat in which she was like what the fuck I’m reporting that and then left the group chat. Like ouch. I know losing friends happens and it’s part of life but being so close to going to college and cutting a friendship on bad/tense terms sucks you know? I’m just waiting for them to remove me from their privates but I kinda want to remove them first lol... they’ve already took me off their private Snapchat’s so yeah. I already felt us growing apart weeks ago just because we weren’t hanging out at lunch but this really bites it. I don’t even think it’s worth trying to re explain myself not to seem like the bad guy. I know they probably think im a bossy entitled bitch because I got promoted and am trying to get people in trouble or some shit like that. I don’t know what to do anymore like I’m tired. 23 more days til graduation but I’m stuck working with them in the summer. Please give advice or if anything like this happened to u?