Why did my ex restrict me on Facebook but not block me?

My ex and i mutually broke up and i haven’t said anything to him in almost a week today i went to our message thread and his name was removed. I went to his page and saw that im restricted from messaging him but he can still see my full profile.. why did he restrict me from messaging me and not restrict my whole profile or why didn’t he just full on block me i haven’t even been messing with him
Why did my ex restrict me on Facebook but not block me?
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