Okk so i like this guyy what should i do?!?

Ok soo we used to date 2 years ago but then i had to switch schools so i hadnt seen him for 2 years! then i saw him when school started this year and our lockers r beside eachother!! i think i like him because we always stare into each others eyes and we always highfive eachother we walk together and we wave to each other like idiots...lol i think he likes me too tho! WHAT SHALL I DO NEXT??!?!?