Why would he block me?

There was this guy I used to talk to every single day. We've known each other for years and we were pretty close friends. We were talking more than usual one week, and the next Friday morning, I woke up and had been blocked. I never did anything wrong. I have feelings for him and I thought it was mutual. I never confessed these feelings so it wouldn't be his reason for blocking me. Why would he do that for no reason?

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Update: Some of my friends that were also in contact with him were also blocked, so I don't think it's something to do with me.
Why would he block me?
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