Why was he so nervous about how I looked at him?

Just earlier on Sunday, he had to reject me harshly over whatsapp because his girlfriend forced him to.

Tonight, I bumped into him at the nearby mall while he was having dinner. I said hi to him and looked straight at him while thinking what to say next. He was flustered and asked why did I look at him like that.

I didn't feel like I was looking at him in any particular way. Why would he thought that way?

Also, he kept repeating what a coincidence it was, how our meeting tonight was such a coincidence, how we lived near each other but never met. What could he have meant?

Why was he so nervous about how I looked at him?
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