How do I cut ties with someone when im no longer interested?

I'm not in a relationship with the person but known them for a while they are always in and out of my life and my emotions were 100% theirs are 10% I've been stood up lots of times and then it's my fault when they want to go out and I don't because they disappear without even making plans etc.. and more than likely they are talking to someone else at the moment so how do I get closure and what do I say that's not harsh? I'm better off without this person it's so toxic
How do I cut ties with someone when im no longer interested?
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