How do you tell a lady friend you're not open to dating?

I have a lady friend who's been after me to go out with her as not just friends. After some persistence I finally told her I've had a lot of bad experiences and I'm just not really interested in dating anymore. She seemed kind of annoyed by this and said she's not those experiences. How do I get her to understand. She keeps angling for me to change my mind.

How do you tell a lady friend you're not open to dating?
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