Questions: Flirting

I known this guy since middle school and now he and i are going to be seniors. I'm complete opposite of him. I'm very loud and energetic like a dog (like he said). He listens to everything i said and when i get jealous he would avoid the females i get jealous of. He would let me wear his shoes and basically annoy him. He always wait for me in my locker and classroom. When i talk dirty to him, he would say i feel uncomfortable or he will become awkward. When i tell him that i like a guy, he would be really distant until i told him im over that guy. His friends always make fun of him for hanging out with me while my friends claim he's my boy toy.

If you say to a guy (you just met that day at an event) party etc. something along the lines of It was nice meeting you and you extend your hand for a handshake but he moves it away and gives you a hug does that mean anything? Or is just a friendly gesture? Decoding man language...