ahah, help- (srs question)

I want to end a friendship that I have on this app. but I don't know how??

this person(whom I shall not name) has done a lot of things that have hurt me. and they dont even realize it. it's been mostly little things, but there's one big thing that they did that really hurt. which, this big thing wasn't something they knew about, it wasn't like she was trying to hurt me. but I still can't stand talking to her anymore. along with various other little things that she's done that have made me upset. but I don't really know how to go about this-

like should I just stop talking to her all together? should I tell her I don't want to be friends?? how does this usually work??? normally I'm the one who's unfriended so I don't know what to do-

also, if I unfriend her, I'm almost positive that there are multiple other people here that would hate me because of it. I don't want to lose those people. but I can't stand her. i honestly shouldn't be so upset with her but I can't help it. everytime I see her post or comment or anything, my chest tightens. I hate it.

this is all kind of stupid tho, isn't it