Is he interested or not?

My boyfriend and I are in a long distance relationship. We call each other almost every night. Sometimes, he just isn't motivated to talk to me and I tell him that we should hang up for today, because there isn't really a conversation, but he doesn't want to. He insist to stay on the phone, until he falls asleep and won't let me hang up. Even if we talked for like 3 hours and the conversation isn't really good, he just doesn't want to hang up. He sometimes makes me even angry, because he doesn't respond well. (I'm talking about something and he doesn't show any interested, for the entire conversation and if I say let's stop talking for today, he still wants to be on the phone with me ).
English isn't my first language, with is why this text doesn't sound really logical, but I hope you still understand.
Is he interested or not?
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