need advice!!! idk if i'm bi or lesbians

so i had a new friend who is a girl. she's one of my boyfriend's bestie. and now she close to me. but idk whyyyy i feel the rush to wait for waiting her reply more than my bf. then whenever i wanna met her...i feel my heart pounding as if she's my crush. idk what i feel, why i feel like that with her. but not with my other female friends. like i feel i need to look nice infront of her and i dreamt i was licking her OMG....can someone knows wtf happening with me?? i have a bf thooo