I think my boyfriend is losing interest. PLEASE HELP! URGENT 😭

We’ve been dating for two weeks now and we’re so happy but lately this week he stopped texting me first so I texted him but he hasn’t texted back since Tuesday. So I texted him Tuesday, “Hey you how you doing? 😍😍”
He didn’t text me back that morning. So I waited until school. So I saw him and I hugged and kissed him but he backed up and nodded. He didn’t do that on Monday. What in good heavens? He just ignored me the whole day. I tried to talk to him but he ignored me. That hurts. I thought he was maybe having a bad day. I don’t know.
We only on campus Mondays and Tuesday’s the rest is online. We’re in high school. He didn’t text me back at all yesterday. I tried to call him. Today I texted him. Nothing.
What should I do?! I hope it isn’t another girl!