What does it mean when a girl say that she wants you but still she isn't ready to officialize your relationship?

By officialize I mean by at least an engagement or by a marriage
She say that she is sure about her choice but still she isn't ready.
What does it mean when a girl say that she wants you but still she isnt ready to officialize your relationship?
What does it mean when a girl say that she wants you but still she isn't ready to officialize your relationship?
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