Im in love with a girl.... whose way out of my league and has had a boyfriend for about 8 months!!?

well its snowing here... so me and my best friend/neighbor thought that since the roads are closed and no ones leaving their houses, that itd be a good day to go sledding! so he calls me and we get together with another friend of ours, and his girlfriend at his house. his sisters there and (bless her heart) shes sick. ive always had feelings for her but shes way out of my league and she has a boy friend. and btw she has a girlfriend of hers sleeping over. so anyways i guess i didn't get the memo that it was SNOWING and i forgot to bring gloves. the other friend, a guy, offered to give me a ride my house on the 4 wheeler. it sounded like a good idea because i didn't feel like walking a couple blocks in knee high snow. my crush got up and started saying that SHE wanted to take me to my house. this surprised me because i figured she wouldn't want to because: 1. she was sick 2. she wasn't dressed appropriately to go drive through all the snow and 3. she had had a serious 4 wheeler wreck about a year ago. and she hadn't drove one since. i did not think that i was worth it. but nevertheless she took me. we were super close on the vehicle. i dont know if she felt anything, but i did. i got my gloves and we went back. the group had some fun and my crush was still sick and taking some medicine in the back of the house. we were all ready to go sled so everyone hopped on the 4 wheeler and grabbed some rope and we were READY!!! then i remembered, we couldnt leave her. i mean we were going to return in about 15 minutes but it would be rude. i tried to tell everyone but they were so pumped to sled that they wouldnt listen. they left the house. i stayed. she saw the vehicle leave and she knew she was alone... then she saw me. she seemed happy. i kind of thought she liked me too. but i never told her that i liked her. i could never. she wouldnt feel the same... would she? no she couldnt! there was a fued in my head. this was the perfect time! i knew my best friend wouldnt care if i dated his sister. this was the time! i was going to tell her! oh wait. she has a boyfriend. theyve dated for forever... so i asked her about her boyfriend. she said: hes mad at me because i stayed the night at my friends house instead of seeing him... they were obviosly fighting. again. its always like that. it makes me sooo mad!! i hate him! but he's way bigger and stronger than me. they were never happy by each other. they were just kinda stuck with each other... when the 4 wheeler got back we went riding. we got super close on the sled and again on the 4 wheeler. it was feeling like a 4th grade crush. she wanted to take a picture with me. what does this mean? is it a sign? or does she want to be just friends? help!!