Why would my best friend do this? Is he interested in me or loves me?

Nimsay
He send me this quiz you can see in the link I'm attaching. Surprisingly young won't find anyone else attempted it except me. It's all about love and marriage: https://quiz2020.com/quiz/7437212
You'll find only one name, so it looks like he made this quiz for me only? And he has been talking about physical/sexual things lately a lot. For example, sharing his gym videos, getting my choice haircut, talking about sex, etc. He's been focused around his career a lot lately and asked me to be his business partner in future.

Being best friends we talk a lot whole dayyy and share everything and care for each other. People in university mistake us as in relationship but we're only best friends. I had a crush on him six months before, and now I've fallen for him again.
Any advice?
He's been acting differently since one week in university. He stares at me with a full grin and if he doesn't sees me at the campus he messages me where I am just to see me
BUT HE SAYS HE WANTS TO REMAIN SINGLE, why? He does want to marry though, but no relationship!
Why would my best friend do this? Is he interested in me or loves me?
2 Opinion