he's treating me horribly, as if I don't exist?

There is this guy at my uni who would stare at me for 2 weeks. He would stare at me so much that it made it uncomfortable at times. However I found him cute and liked him as well and wanted to talk to him but initially he would only stare but never smile or talk.

4 days ago we encountered each other completely alone and he was gazing at me and I finally spoke to him and we talked and exchanged names. We shook hands as well and he touched my shoulder.

However since then he has been ignoring me and acting as if I don't exist. He clearly sees me but ignores expertly.

I don't know what happened. Why is now acting like this? If he never liked me why did he stare and touch?
he's treating me horribly, as if I don't exist?
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