Why is it that when I tell a girl that I don’t want a relationship, they stop talking to me?

Every time I tell a girl that I’m not interested in a relationship, they stop talking to me completely and don’t even want to be friends. I’d been attracted to this one girl for months, but she kept rejecting me. She finally gives me a chance and when I tell her that I’m not interested in a relationship, she starts giving me the cold shoulder and avoids me.
Why is it that when I tell a girl that I don’t want a relationship, they stop talking to me?
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