How do you stop a man from pursuing you when you’re fairly sure he’s too mentally unwell to consent to be with you?

My intentions were good when I fell for this guy. I fell in love, not realising how unwell he was. So once I realised, I backed off and moved on. Now he keeps showing up where I am and he said he won’t give up until he gets me. I think this is not good, so I keep ignoring him. But he keeps persisting. I think having a relationship, he’s probably not fit to consent. So I want him to stop but I don’t feel threatened.

How do you stop a man from pursuing you when you’re fairly sure he’s too mentally unwell to consent to be with you?
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