does he like me or nahh?

I just need good advice. I liked this guy for about 4 months now. I know he use to like me. He always flirted with me all the time. He would poke me, pull my hair playfully, put his arm around me when were sitting by each other, and always teased me. Also tickled me. It was so obvious he liked me. Even his friend told me. He tried himself to tell me he gave me hints but I haven't payed attention to it at all. But latley a few weeks ago I think he lost interest in me. Idk. I still like him a lot. But last Thursday I was in the library with some friends. And he came in there but was on the other side with his friends. He waved to me and my friends but I didn't wave back. I left after 20 seconds of him being in there. And he came up to me in the hallway and I didn't see him. And he thought I was avoiding him which I kinda was... And he said "fine I'll skip fifth period than". And he never came back to class. I said I'm not even mad at you. And he said "your always avoiding me." And walked off. Friday the next day he came up to me in class when I was alone and asked me "why are you avoiding me?" I said I'm not. And he said than why did you leave the library when I came in there? I lied and said I went some where with a friend. And he kept asking a lot of questions. Like t where? With who? He thought I was lying. Does he like me? Why would he care if I'm avoiding him if he doesn't. He seemed like he cared a lot. Also my friend asked him do you like her. And he said ya as a friend.