Why is my boyfriend sometimes upset when I say goodnight?

There are instances when my boyfriend is fine with me saying goodnight. He just goes ahead and readily replies goodnight as well but whenever we have long conversations, it looks like he enjoys them a lot and will get a bit upset if I try to end the conversation.

Like right now, i said Goodnight because I felt sleepy after a long conversation and he wanted to confirm whether I'll be sleeping. I said yes, i might be sleeping already cause i keep getting sleepy.

He then said at least I informed him and he thanked me for informing him. I don't know why it bothered me a bit. Why does he seem upset when i say goodnight?

Why is my boyfriend sometimes upset when I say goodnight?
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