Why does my ex stalk me he is everywhere where I go?

It's been 5 months since our break up like 2 weeks ago I followed my friend on TikTok then after I got out the bus just 2 minutes later he walked past me and yesterday I was in a shoe store in my city looking for new shoes and when I put 2 shoes back I turned around and my ex stood behind me I had panik attack and left the store or one time I took a walk outside he was in the same place acting like he is doing something then saw he turned around to look at me and some days ago I was longer online on Whatsapp he told our mutual friend why is she so long online? He was angry but yesterday what happened scared me really bad

Why does my ex stalk me he is everywhere where I go?
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