Girls? Q&A about this girl?

There`s this girl in my history cl and math cl, i'm known by pretty much everyone in math cl, so anyways i was talking to a friend in history and she walks by to get her paper and he asks me “would i talk to her?” and i before i could even answer she says “of course shaun would talk to me” then she walks off, then my friend tells me about her “good” features, if you what i mean ;) Then, later on, were im sitting, chatting, and shes on the other side of the room, smiling at me, fearlessly. I`m kinda shy around pretty girls, but i smile back anyways, then i look down, and she`s still smiling at me! Then today, i`m leaving the cl for a mins. and shes just coming in, then says “why are you leaving cl shaun?” in a really playfull tone. I get kinda tounge tied but i manage to get out the words “the office” then i leave. Later on, i get back and im talking to my friend when he walks over to the girls table. He starts talking to them and my name comes up. When he comes back, he doesen`t tell me what they said but the girls start giggling soon after. Girls? Whats going on? Is the girl crushing on me?