My 11 year old brother is having a crush on me

My 11 year old brother is having a crush on me (17). We were driving to our country house last night and he sat in the back seat with me. He was watching me for the first half an hour of our drive then, suddenly he came close to me and stole my phone just to look at my photos. Lately he's been obsessed with looking at my face. He looks at it for hours at a time. When I was like 15, he was underweight and was taller than me but I started to work out and eventually I get so muscular that I lifted him up and he cried. I remember he looked at me and said that you're so strong and I felt real pride. For the rest of the ride he kept stealing my phone. He even kissed my hand and hugged it. He's so cute. He has brown hair and big bright blue eyes and long eyelashes. He's always been a cute brother but lately he looks like a completely different person.