Help, Guys? And Girls too!?

Okay, so me and this guy have known each other for about 2 or 3 months, and we talk and play around with each other all the time. Today, he started acting different, slightly different, but different. At first, he started poking me, and trying to find my "tickle spot". The guy who sits behind me used to poke me and pull my hair, and he told him to poke my waist, and when he poked me, I started giggling and squirming. In the middle of class, he asked to see my phone, then asked me for my number. I have a new phone and I have a habit to forget my own number, so I told him that I forgot it, and he told me to text him. After he gave it back, every single time I dropped my pencil or something, he offered to pick it up, and it went to the point when he tried to pick it up, it was closer to me, but still out of my reach. He tried to pick it up, and when he couldn't get it from how close to it he was, he leaned towards me, to the point his face was inches from my thigh, and when he couldn't get it, I teased him, and pulled it closer with my foot. There's a guy who sits behind me that always annoys me, and today he threw papers at my cheek. After my friend saw this, everytime he tried to even bring the paper near my face, my friend would grab his wrist and take the paper from him. He started poking me and pulling my hair, and again, once my friend saw that, he grabbed him wrist in a really serious way, and said, "That's Enough, David." After that, he did what he usually does, so I wasn't really weirded out. Towards the end of the period, he started drawing on a piece of paper, and wrote, I Love You. He put it in front of his binder, and I asked him whose name he was gonna put on it, cuz he made one a few days ago, and put the name of a girl he liked on it. He told me that he didn't really like that girl much anymore, and that he was gonna put the name of another girl on it. When I asked him, he said he couldn't tell me, but that he'd tell his Tristian, whom he tells about every girl he likes. He usually tells me about who he likes too, so I was surprised that he didn't tell me. I started guessing who it was, and he told me that I was close when I asked him if it was Sophia. My name starts with an S and ends with an A, so I've been creeped out since he told me that, so help?