Search Results: he acts different around his friends

I started a new high school for my senior year and I'm a introverted person, I don't talk much, unless you come up to me, I'm friendly nonetheless, I like talking to people. In the beginning of the year, I never expected to I guess to have any interest in someone. I had this on class with this guy and over the course of the school year we had exchanged looks, waves, and smiles (deliberately trying to see each other in the hallways), shared candy together and he has tried to make small talk, (I complimented his drawing, talked about his favorite show, not much more than that, because I was too scared to I guess go up and talk to him more.
I get nervous and tongue-tied around him to the point of where I feel nauseous. I have tried my way of I guess showing that I do have an interest in him, offered candy, sneaking looks at him, smiling, I attempted once to sit by him and He moved closer to sit by me, and after the first semester, our classes got switched so I only see him in the hallway when I went to my 2nd period, sometimes my 3rd period and maybe at lunch, so this semester we don't get to see each other much and we sort of smile at each other, but lately not as much. We just have this intense eye contact and now I started to get the feeling he had lost interest in me, since he's smiling a little less and I got to thinking maybe I was reading into this the whole time and that he's just a friendly guy. Perhaps all this time I was overthinking it.
Now as I think back, there were so many opportunities to make a move, but I let my anxiety, and shyness get in the way, I realize sometimes when I would walk past him, I wouldn't make eye contact, cause inside my stomach is turning flips and I'm like "oh crap, he's here.. act natural" I would tell myself I would go up and talk to him then chicken out once I seen him.
So the story is today, everything just felt different. School ended and I was walking home and I know him and his friend (the was girl there too) saw me.

So basically this guy at my school has been joking around with me or flirting with me whatever you call these days. He calls me stuffs like "girlfriend, babes, bae, beautiful, sexy" but I think he is joking because I'm not any of those stuffs that he says. But it's been going on for quite a long time now like 4 months. Every time he sees me he's like "Girlfriend" and sometimes he does call me by my name but it's just confusing me as I am getting these mixed emotions and signals.
But the other time I unfriended him on Facebook right before he called me "girlfriend" and I was gigging after but he said he was joking and so I unfriended him because I felt like I was just a girl he jokes around with.
One time I was absent to his lesson (I always go there to finish off some work in his lesson) and I was absent so he asked of my friend that "Where's my girlfriend Edna" and my friend said she is obviously in her lesson. But I don't get why he asked of me after saying "girlfriend" when he clearly said he was joking the last time he said it?
And I felt bad so I added him again and he added me back 3 mins later.. But he didn't ask me in school why I added him back.. I'm guessing he didn't know.
And then I came to his lesson and I had a headache so he was like "D'you want me to make it better?" And I was like "No" and he was like "Aw"
And then after lunch he asked me how was my headache? And I was like "it's fine thanks" and I was really surprised that he asked but I don't get it?
And then when he had football on Friday and I was kicking the football and he was like to our coach "Give my girlfriend a place" and the coach was like "she already has she is playing on Wednesday"
My friend said that the way he jokes with me he has never done that with any girl like he acts different around me than other girls.
That's why I'm here to ask for your opinions and what you guys and girls think? Please help?