Why is he doing this to me!!?? 10 points best answer!!?

okay so the first time we met we got along so well. and all the time we would be smiling and be happy. this was two yrs ago. now i tried talking to him again and the convo went well but the next time we saw each at school he gave off this awkward vibe which i didn't like at all so i never tried to talk to him again. lots of my friends think he likes me again (we both liked each other two yrs ago) he stares at me a lot. especially these couple past days, we would just look at each other for like 3 seconds until i break the eye contact. at one point one of my friends saw him looking at me when we were going up the stairs to go to our cl. she said he had this nervous expression on his face. another point my best friend sits next to him in a cl. he acted very depressed that day. not doing anything just sitting on the floor staring in my direction. she said he looked in my direction with a deep thought expression on his face. she aslso said while he was looking in my direction he sighed and ran his fingers thru his hair frustrated. one time me and my other best friend were walking to cl and he was behind me which i didnt notice. he goes in front of me and pretends to check the time on his watch twice. to me it was obvious he was trying to show it off to me. also he would walk very close to me. there were only a few times where he brushed his arm against me. only time where he brushed his arm against my waist. ive also noticed him touchin his hair a lot when im around. also one time he was presentin sumthing and he wouldnt stand still. i would see him look in my direction real quick then look down to make it seem like he wasnt lookin in my direction. also he had his arm behind the chair and he doesnt do that at all. this was the first time ive noticed him do that. he would also look to the side and i guess look at me from the corner of his eye. yesterday i was at my locker and i was talking to my guy friend and he comes over to wait for ahis friend i guess and theres enough space for him to go on the side of the way instead he goes in my way. i get out but i feel his arm brush against my back. im wondering why is he doing this? Is it because he wants to talk again or something? does he like me? idk so please help!!