The girl I like stares at me, but...?

dude....go for it i regret not doing it this one time this girl just kept lookin at me during 3rd period even my freinds told me dude tht girl keeps lookin at you and when i look back at her shed kinda have this blank look on her face never blushing or smiling just lookin at me and later i found out she liked me but she got a bf before i could talk to her