Do he like me? Because i like him.?

Okaii well He always tries to sit on my lap and once he told me to stand up and he sat in my seat and then he asked me to sit on his lap, when i did he rapped his arms around me and we just talked for ages, when he with me he doesnt talk to anyone else apart from me and he always wants to be sat on me. Today he snuggled up to me and put his face against mine. He asked me to go out with him and a few mates tomorrow night, i do want to but i only want to go if i think he likes me? we never talk online but hes always with me in school. Does he like me? How can i flirt back??