I sent a DM to a guy I liked and he unfriended me, the next couple of days he was looking at me sad and his friends were too, what could this be?

The next day I skipped lunch because that’s the time I usually see him and then he skipped lunch too. The day after that he spotted me right away and looked at me sad, inviting almost. I’ve seen him and his friends together and they all looked at me kind of the same way, sad. He once saw me so he changed his position real quickly too.
I sent a DM to a guy I liked and he unfriended me, the next couple of days he was looking at me sad and his friends were too, what could this be?
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