Why does my ex stare at me but doesn't talk to me?

Anonymous
my ex broke up with me 3-4 months ago he said our relationship was awkward and it wasn't working. soon after we go back to school and everyday he stares at me my best friend even counts all the times he stares I think it's kinda werid. even I catch him staring at me what does it mean? plus he never talks to me so why does he stare?
Why does my ex stare at me but doesn't talk to me?
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