Is this a red flag?

This guy I have been dating for a few months calls me constantly. If I don’t get to the phone to answer the first time he calls, he calls again two hours later and if I don’t pick up that time he calls again maybe 30 minutes later and when I do finally pick up he questions me about what I was doing and why I didn’t answer when he first called. It could be innocent but it seems kind of controlling.

Is this a red flag?
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