Why does he remember everything that has to do with me?

The first day I met him at school we told eachother our names. I only told him mine Once and he remembered it. He didn't remember my Friend's names. He told me his and it took me 2 weeks to remember it after him repeating it many times. He tells me things that I never remember and when I tell him things and bring it up later he remembers insantly and the weirdest thing about it all is that I let him play a game on my iPhone one day and I gave him my passcode, telling him only ONCE what it was. I didn't even worry about it because no one could remember something like that. Then the next day while I was doing homework he took my phone and I was about to say the passcode but he cut me off and said "I know what it is, you don't have to tell me." and sure enough, he knew it. My friends and family can't even remember my passcode after telling them 10-20 times. What's up with this guy?

There's a dude in our school like him he remembers everyone's street addresses