What should I do? He deleted my number... why?

A guy in one of my classes at school went up to me and asked me for my number. I thought that was sweet so I gave it to him. He didn't text me until the next day but I didn't want to seem needy so I Waited an hour to reply after every text he sent me. I then told him that I had to go and said good bye. After that, he didn't contact me until 6 days later when he asked about an assignment but he didn't reply back after one message.
He then replied the next night but I didn't reply to not seem needy. He didn't contact me again after me ignoring him. During class, he would act normal but I found out that he deleted my number after I decided to text him 2 weeks after his last message when he responded with "uhhh who's this?"

why did he delete my number? I want him more now, what should I do?
What should I do? He deleted my number... why?
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