Why he want to listen to my voice everytime he is sick?

He would be like "I just need to hear your voice to make me feel a bit better"
"I need to listen to your words and voice to make me feel better"

We meet and talk everyday, so to say he miss me, nahh
But everytime he is sick, he will say that

Is that normal between a friend or he actually likes me?

Why he want to listen to my voice everytime he is sick?
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