What's the deal

So there is this boy in my class, and I am not a type to talk to boys (I just can't approach people that easily even girls, so boys are on different level).One day I was going somewhere and saw that guy with some other boys (they aren't in my class) and they were smoking and he blow a smoke and I saw him and our eyes met for like 0.001sec He didn't look like someone who would smoke. I was so surprised but I went with it and didn't care that much another day he comes up to me and asked if I saw him yesterday and I am dumbfounded (keep in mind we have never spoken a word its the first ever convo we have )I said no and he was like you didn't and I said no I have no idea what he is talking about and he left. Since that day, he has always come up to me and tells me I didn't somke today wth.like every single day today was like 8 or 9th day.