What does this mean? Women please answer ?

Ok, there's a girl that I'm really good friends with, like, to the point that we'd do anything to help the other if one or both Of us had something bad going on in our life. Anyways, I used to have a big crush on her in 8th Grade(now I'm a sophomore in HS). But she has a BF and I've not really dated a lot yet. But during English ill cOnstantly look over casually and sometimes see her either taking a quick look towards me or even staring at me sometimes. It's not a casual look in my direction either, it's right at me. Like I said, she has a BF and me and him are good friends as well. What does this mean