Are they true friends?. or are they being fake?...idk?

Today at school i asked my friend bianca does her sister have a problem with me. and she said no but when i was in lunch i said : HEYY JASMINE! nd she ignored mee. (idk if she heard mee or not). but then as me and my friends talked.....bianca and jasmine was talking about this boy that looked like justin bieber. and i was like who looks like justin bieber ....and no nobody answered mee so her sister turned her head and mummbled something and then when i looked that way bianca tried to laff it off and say :oh we talkin about this boy.....but idk.....