Why do I get very upset when my boyfriend takes too long to text me?

We talk on phone 2 or maybe 3 times in a day. And text each other like 2 times. But when it takes like 4 5 hours without any conversation, i immediately get angry and upset in myself. Is it normal? Or i think much about this situation? I don't wanna bother him as well.
Why do I get very upset when my boyfriend takes too long to text me?
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