What does it mean if a girl look at you ,like looking into your eyes for more than normal..from?

... distance (like we look at each other eyes for 5-6sec) and that's for few days and then she started looking at me just for 1sec and then looks away pretty quick ..like (because i was looking at her ,because i like her so much and she just looked at me for less than sec and turned away quickly)??? does that mean something??