My ex follows me everywhere, and when I added him on snapchat he blocked me! Why?

Anonymous
I have an ex I know we still have feelings for each other, because everywhere I go he follows me around, he will look at me and look away, talk really loud for attention, so I figured I add him on snapchat to try and make mends. When I added him, he added me back and then blocked me a few hours later. Wtf. And of course when I saw him, he started to walk right next to me, talking really loud for attention. What is his problem? Am I suppose to chase him?
My ex follows me everywhere, and when I added him on snapchat he blocked me! Why?
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