Guy turned to look back at me?

A guy I know at uni (with whom I have been on dates with but didn't have sex) did this. we crossed each other on the street and waved at each other. I went in a different direction and he went to the other direction.

I turned to look back and saw he was at the edge of the street , quite far away from me (and the street was a bit crowded so it was obscuring my view of him) waiting for the green signal.

I turned again and saw him this time amongst the bunch of people and noticed that he had turned back and was looking in my direction.

The green signal came on and he went forward.

Why would he do this?

Guy turned to look back at me?
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