How to stop being friends with someone

I need advice yall. I made a friend on bato a few months ago and we exchanged discord users a little before it shut down. But god damn. I don't really like this person anymore and I want to stop being friends with them. I don't want to be too specific because I'm pretty sure they have an account on mangago now but they've crossed so many boundaries and I'm too scared to confront them about it since we have mutual friends. They keep trauma dumping on me, offers information I never ask for, and keeps reaching out even though I began ghosting them. I don't remember the last time I initiated a conversation. Every convo we have is just them talking about themselves and me reacting. And whenever I bring up something of my own they seem disinterested and don't make an attempt to follow up on it. Everything is always about them. I'm exhausted by this friendship. I honestly wouldn't mind if we never talked again. I've made friends who I've gotten so much more closer to in half the time I've know this friend. Recently I've been pretending I'm offline. I haven't responded to the last five times they've reached out, hoping they would get the hint and they just... don't. How do I end this friendship?