Why did my ex boyfriend call me and say, "Don't be a stranger"?

Anonymous
My ex boyfriend made up and excuse to call me, and while we were talking he said, "Don't be a stranger." What does that mean? Does he want me to contact him, or was he just trying to be friendly? Is there a chance he may want to get back together?
Why did my ex boyfriend call me and say, "Don't be a stranger"?
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