@ToatsMyGoats,
We change as we get older number one. When I was 14, I thought I had a long neck for a female, awkward looking even alas late teens early 20's I ended up a model go figure.
Secondly, he is only 16 love and has had girlfriends and is bi. He perhaps likes his stance in that regard but you are gay and older as well, I believe that he does look up to you like a Brother and feels comfortable with your stance being gay as he is not, he is bi so safe. Perhaps experimenting with "love" and what that would be like.. I believe you are his safety zone.
He's your best friend as well, so I'd suggest to you just be one there are plenty fish in the sea and there is all sorts of "love" that goes around not all means togetherness in a sexual/relationship way, some mean friendships in a friendship way.
Also as you mature those beautiful eyes will open wider, look brighter and I'm betting you will look handsomer as well, so quit with the thoughts of yourself not being attractive.
As your friend said, beauty is inside more so.