When He Gives Me A Glare Every Time I Walk Past Him , What Does That Mean?

Every time I walk past my ex he gives me this "I hate you" glare. It makes me totally uncomfortable, and It freaks me out. I was at a band concert yesterday and he was there. I felt him kind of looking at me when I wasn't looking. I was talking to a friend when I saw him in the distance glance over. And when we were relatively close to eachother he gave me another glare. It keeps happening and I don't know why.
When He Gives Me A Glare Every Time I Walk Past Him , What Does That Mean?
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