I think this guy's obsessed to me! Help me?!?

This guy'a a senior in our school. He's a football player and at the same time a baseball player too. He's quite famous for his atheltic skills and looks too. I admit i had a crush on him before! But now i don't have since like every girl in our campus likes him. One day i was on my home walking and he suddenly called my name.. So i stopped and looked at him. I was shocked at first because i didn't know he knows my name and we didn't even talk before. & then he offered me a ride way home so i said yes and we talked a lot, laughed and all. It was fun! & i started liking him again but as days goes by he's beginning to act differently.. He always gives me roses everyday, chocolates too. & calls me everytime and dont even know how he got my number. & even when it's midnight he would creep in outside our house to check if I'm alright. & would not attend his practices just for me! & the craziest thing is he knows all my biggest secrets! Even my parent's numbers! My siblings infos too! I don't even remember myself telling me those details to my best friend for him to know or ask. I'm really creeped out! & he has all my baby pics! I really wanna freak out! & the worst is he treasured all the things i used like my candy wrappers, ice cream sticks and even bottled waters! What to do?!