She said "Don't be a stranger and message me or private message me tomorrow".

I was talking to my girlfriend last night. She wanted to go to bed early because of school. I told her goodnight and she said the same. She also said "Don't be a stranger and message me or private message me tomorrow". I wasn't sure if she was under the impression we had broken up or not. I asked her why she said it but she had already logged off so it was too late.

Why did she say this?
She said "Don't be a stranger and message me or private message me tomorrow".
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