It seems he has “friend zoned” you.
Meaning you have earned his trust as a friend but doesn’t see you as a sexual partner.
Why you ask does he not see you that way if he finds you attractive.
Well some men have a specific type or style of woman that sexually excites them.
Sometimes it is a buxom blonde, girl next door, or well tanned athletic sporty chic. The list is endless. I don’t think any of us can logically explain our preferences.
On the other hand are men who are pure horn dogs who will hump any available female anyplace anytime.
It appears your friend is not the latter.
I hope this gives you some insight.
The Leftists have left us!