What does he mean by “understood?”?

I told a guy when I would be in town but if he was going to keep being mean to me, not to talk to me and that we shouldn’t meet up. I liked the nice him. Not the mean him.

All he said was “understood.”

What does that mean?
He don’t care
Vote A
It doesn’t mean anything one way or the other.
Vote B
It means F you basically.
Vote C
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What does he mean by “understood?”?
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