Awkward?

I am going to a graduation for this girl who has always been realky nice to me. The problem? Her little brother was in my class (she stayed to graduate) before he moved. He had the biggest crush on me and I forced mgslef into liking him because I was confused. Now I'm seeing him for the first time in a year and I'm asexual homoromantic. Basically gay but not sex (Tmi I know). I am afraid he's gonna try to rekindle something and it's going to be like... Ummmm... I'm gay... HELP???