Why would a guy unfriend me on snapchat?

This guy who is my friend (we are not super close but we are friendly) recently unfriended me on snapchat. I saw this when I was checking our chat log on there. So I'm just curious why do you think he unfriend me and if it were you what would make you unfriend someone on snapchat? The last thing I had posed on snapchat was an art piece my friend had made. Also do you think I should bring it up when I see him?
Why would a guy unfriend me on snapchat?
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