Guy ghosted me then said hi at school?

There is a guy who knew I had an interest in him. At that time he told me he was wasn’t dating. Anyways he stopped talking to me or replying.. well I saw him at school two days ago. He walked up to me and said hey how are you doing? It’s great to see you. I was a little surprised considering his lack of interest over the summer. Do guys do this just to save face?

Guy ghosted me then said hi at school?
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