What does it mean if he immediately hangs up, when I suggest hanging up the call?

I don’t understand it sometimes, we‘re long distance and he basically is the one who asks me to video chat, but then tells me to go to sleep or if I say we can hang up he immediately hangs up and doesn’t insist on talking more. What should I think about this? How should I communicate this with him?
What does it mean if he immediately hangs up, when I suggest hanging up the call?
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