Is it normal to feel anxious and sad when he talk less?

I like him more and more. and we texted a lot. but since his birthday in last month, he started to talk less. I feel like I no longer fun to him. i asked him why he talk less. and he said he got more things to do. but when he have some days that he has nothing to do.. he didn't initiate to talk more and even ignore my messages.
Is it normal to feel anxious and sad when he talk less?
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