What does it mean when you go without texting him so he texts back?

Anonymous
My guy friend and I have been talking for 4 months we usually fall asleep on call and sometimes he would text in the morning when he goes to work but sometimes he doesn’t text me all day but I know he’s active. I usually text him first to start a conversation cause I worry that he’s gonna stop talking to me. I didn’t text him back at all today until he texted me what does that mean?
What does it mean when you go without texting him so he texts back?
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