Kerri,
I'm very into an asexual nerd. We made out once for a week, but that was about a year ago. We talk every day and I make my intentions clear, which he deflects. I'd be fine if it never happened because I appreciate talking to him and his friendship more than I need a physical relationship with him. I still can't help but wonder if I'm not doing anything that could take this further. Advice? PS- he likes my butt.
Well, he doesn't sound too asexual if he likes your butt ;) , that's definitely some sort of attraction, which is good news for you! This situation seems tricky because there seems to be flirting from both of you, which makes it strange that he ignores you when you tell him how you feel. Yes, there are probably a million things you could do differently to take the next step in your relationship, but if he isn't understanding all of the hints you're dropping, you really just need to straight up ask him if he feels the same way! Let him know that you're okay with never being anything more than just friends so he doesn't feel weird in case his answer is no. But, I don't think he'll be bothered by you asking because you seem to share a great friendship and history.
Good luck!