Should I worry he’s not sexual with me anymore?

Met a guy through an online app 2 months ago. We live far from each other,4 hour drive. We’ve been visiting each other every 2 weeks, things were great. Now since last week, whenever I initiate any sexting, he says he’s working. We still talk all the time, and he initiates most of the conversations. Am I overthinking?
Should I worry he’s not sexual with me anymore?
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