My ex unfriended me on FB, why?

CarinaCath
I broke up with him and after sending me an angry sms, which I did not answer we didn't talk for a while. Few days ago, I went online and noticed that he wasn't online, he always is. So I opened his FB and saw that he has unfriended me and I was shocked! This was so like a preschool stunt to pull.

Why would he do such a thing?
Updates
+1 y
I stayed friends with my first ex. We get along well and are friends on Facebook and off Facebook.
My ex unfriended me on FB, why?
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