Why would someone who ghosted you run away/flee?

Anonymous
Couple months back me and a guy friend were cool, then all of a sudden he cut off all communication with me; yet still watched my social media. So I removed him off of social media since it was just uncomfortable.(Knowing this person could’ve care less since they didn’t communicate why they ghosted me; yet still keeping a close eye on me) I ran into him at a grocery story the other day, and he did a full stop and U-turn when he saw me. I just don’t understand why, especially if this was a situation they caused.
Updates
+1 y
Just to keep in mind; I’m not wondering why he ghosted me; we haven’t spoken in for over 6 months. And I’ve been fine ever since, I just don’t understand why he would run away; when he made the decision to ghost.
Why would someone who ghosted you run away/flee?
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