how can i say it in a nice way..

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This guy at school. I wouldn't call him a guy, more like a boy. He's a freshmen and i'm a senior. For one of my classes I am a teacher aide for his class, and he never leaves me alone, he is always talking to me and I just make short answer's thinking he'll leave me alone. In the hallway I am walking with my friends and he came up to me and poked me in the arm and was like " POKE" thinking it was funny, and it deff. was not. I don't want to hurt his feelings but I can not stand him always talking to me and being annoying. In class today I just happened to walk past him and he "poked" me again and i just kind of chuckled and walked away. I don't know what to say, or if I should say anything to him anyways. Should I just ignore him, what should I do or say??