Please,I need help,can u all please help me?

Its not about me,but my best friend.She fell in a relationship with a boy who is quite nice,but sometimes a flirt..he really loved my friend,i can tell that..they were in the same school,but in different blocks..so they mainly conversed on phone..then suddenly after some days,,he started ignoring her..she dint know why,she always called him,but he dint reply,so i advised her to stop calling him because i thought it was like begging to him,but now after so many days,he still stares at her,his Những người bạn still tease him bởi her name and he still gazes at her with the same intensity..
Can bạn please tell me what it means? Does he like her? hoặc what? Please i need your help,for my friend..please...what should i tell my friend? she is really sad..do help.