He doesn't acknowledge me in public?

My boyfriend and I have been dating for a month now, and everything is good, except when we're at school, he doesn't voluntarily talk or acknowledge me. At lunch, we sit at the tables next to each other but not together and yet he would never say hi or wave to me. He walked right past me the other day without even looking at me. When we have intimacy or on the phone, it's all good though. What does this mean? Should I just let him go?
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(under 20)
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thanks so much everyone!

I'm gonna have a serious talk and kick his ass D:<
He doesn't acknowledge me in public?
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