As someone who identifies on the aromantic spectrum, I think about AlHaitham being aromantic a LOT. The most popular thought is Haitham being asexual and, while I do agree that it's an amazing thought - and have spent time turning it over in my own head, myself - the aromantic spectrum is much more personal to me.

And it makes sense.

It's very possible that someone so deeply rooted in knowledge, and the pursuit of it, just doesn't feel the things that those around him may feel. Perhaps that could contribute to Kaveh's thought that he has no sense of romanticism, is a brute, etc. It could very well be one of his best kept secrets.

Can you imagine how Kaveh would react when he found out? Everything would make sense, right? He may also feel incredibly guilty for saying the things he has, about Haitham; but the possibilities are endless and, personally, I would LOVE to further explore this.