Flirting

When a girl bumps into you on purpose?

So i was going to this class for a while, and one day i sat next to this girl, the chairs are really close there is no space to get in or out, when she saw me coming she changed her seat so i would have to pass through her to have a place to sit. Few days later at the store when i came her friend told her something then she turned toward me smiling, then few days later she loomed at my eyes deeply whole she is putting a lipstick, then i didn't see her for a while when she saw me at the store her friend passed by me from behine then she passed and bumped into me then she smiled and said sorry i said sorry too. Why would a girl do that?
When a girl bumps into you on purpose?
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