Why does he disappear for a week or 2, and then comes back and tries to talk to me again acting like nothing happened?

We’ll be fine, he sleeps over and everything but then he’ll randomly stop calling and stop texting sometimes won’t even be on social media and says he does this to everyone even his friends not only me but I don't know I feel like it’s another girl but he always says it’s not I need to relax

Why does he disappear for a week or 2, and then comes back and tries to talk to me again acting like nothing happened?
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