Why would my male friend unfollow me on ig?

Were friend for about 2 years. We would talk a lot back and forth daily through messages. Until yesterday he unfollowed for no reason but continued to let me follow his account, so I unfollowed him too since I felt it was a dick move to do that without communicating if he felt upset about something. So today he went as far to block me. For me, I saw him as a friend nothing more. Any reason why he would unfollow yet let me continue following him and once he saw I had unfollowed him why would he block me? This is a 40 year old man keep in mind...

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I should point, nothing offensive was said to him. We were talking the day before. Apparently something made him upset at home and I said if he wanted to talk about it, that it was completely up to him. He saw the message and unfollowed.
Why would my male friend unfollow me on ig?
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