How would you deal with an erotomaniac?

How would you deal with an erotomaniac?
As to avoid misunderstandings, let's give the definition - Erotomania is when you think someone is in love with you but they're not. It may be a person you've never met. They might even be famous, like a politician or an actor. You can be so sure of this love that you think you're in a relationship with this person, or that stalking them means you are ''dating'' them.
Erotomania is a rare mental health condition that happens when someone is fixated on the idea that another person is intensely in love with them. The other person may be a celebrity, wealthy, or of a high social position. The condition is also known as De Clérambault's syndrome.
Let's discuss about it in the comments.
How would you deal with an erotomaniac?
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