what does this mean? Please help confused!!?

Ok so I'm pretty sure my friend likes me because he has shown a lot of signs. Anyways we and the rest of our friends were hanging out on Friday. There's this other girl that he might also like but i'm not sure. Anyways we were at Denny's and i was sitting between my friend (who by the way I like) and the girl. He kind of kept leaning over me to talk to her and stuff. Then later on the girl started to not feel that good and like she almost puked at the table. My friend was like comforting her and stuff like he put his hand on her shoulder and he was like "are you alright?" and stuff like that. And when she went to the restroom to try and puke he paid for her dinner. But anyways I'm confused because at the table he was staring at me I guess because my crush said to the girl "why are you staring at me?" and the girl was all "I thought you were staring at me" and my crush said "actually I was staring at her (meaning me)" and also when we were leaving Denny's he asked me if I would like to go to a water park with him and he didn't invite the girl. So i'm a little confused because he does stuff like this all the time. like he'll sort of flirt with the girl and then he'll do something like invite me to something and plus there's other stuff that he only just does to me and not the other girl so it's confusing.