Why did my ex block me from Snapchat & instagram but not Facebook?

So I had a teddy bear that he gave me and I "cut" it.. he blocked me right away from Snapchat since it was on my story.. a few hours later he unlike my instagram pictures and blocked me. I waited to see if he block me or unfriend me from Facebook but he didn't.. a few hours later I told him that I actually didn't cute it.. he told me he didn't want to be friends.. but why he didn't block me?
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