DM a guy and I feel sad?

I dmed a guy who I thought was cute and I had never spoken to him, asking him about his school because I was genuinely interested in transferring. He replied and I asked him some questions. He answered some questions. And then left me on seen. Two weeks later, I ended up making my decision. I wanted to thank him for his help and time, so I dmed him. And he ended up replying by saying np and good luck- I don't know why it just doesn't sit well with me. Guys please help.

DM a guy and I feel sad?
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