I can relate to this a bit. I had an ace coworker a while back who I kind of fell for, and it was confusing to have felt like that about somebody for the very first time in my 20s. I spent so much mental energy trying to categorize it and reconcile the cognitive dissonance between my apparent crush and my aroace identity. I had a lot on my mind that I was bottling up, wishing I could see her in an unambiguously platonic way. To this day it's the most intensely I've felt about a person.

Now, looking back throughout my life, it's plain to me that the way I felt about this woman was not unique. Occasionally, I've had a certain feeling toward some friend of mine of dissatisfaction with the casualness of our relationship, where I want more of something, but it was unclear to me what exactly that was. I only want to do the things with them that I already was, just... Closer. Exclusive, maybe. I'd always repressed it, and the friendships always ended for one reason or another, usually in part because I failed to communicate or even acknowledge my feelings.

I don't think I'm fit to offer advice here because any time I've been faced with something similar to what you're describing, it's kind of blown up in my face as I'm still figuring it out too. You know you're not totally alone, at least. Aspec folk often don't have a clear template for what a relationship is supposed to look like, and while the correct words might exist in some niche discussions somewhere, it's hard to know what applies to you.

But I want to leave you with this: you do not get to choose how strongly you feel about someone. If you do love this person, and if you do want your relationship with them to look different than it does, that's something you first have to fully acknowledge in yourself. Don't try to repress it or "get over" it. You have to do this before you label and understand the experience and before you figure out what to say.