Why did my ex stare at me?

I was sitting at the bus station and my ex stopped on that road because the traffic light was red and at first I didn't think it's him but he was so close to me with his car and he was looking at me like checking me out wtf then he looked away then again at me didn't stop looking at me (we broke up 3 month's ago and since then didn't text or talked or saw each other) and I had already deleted him from everywhere

Why did my ex stare at me?
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