im soooo confused about this ONE GUY HELP?

ok so ive known for this guy for awhile but recently we've been hanging out friend group wise which we got a lot closer. we re both each others #1 on snapchat which we have the yellow heart. one time when we were hanging out one of his friends went into a store which where we split up but i looked back and he was running which he just left his friend behind, but eventually his friend caught up and is that somewhat of a sign? also we were on the train platform but he was on the opposite side until he ran over to our side and tried scaring me.. i hope these are signs but from a guys perspective is it? not only that but i ve noticed that he kind of mocks my movement and somewhat always comes near where i am.. idk if thats a coincidence or if that's something. we go to different high schools but we talk everyday.. his friends tend to tease me saying "he's trying to finesse you".. what exactly is going on? only thing is he's very shy and never had a girlfriend...