As someone who is, indeed, Aromantic, this game felt as though I was being called. I'll use the metaphors here to explain my own experience.
I never realized my heart didn't beat until I was into my late teens. One of the experiences I've experienced earlier is why I say that. I didn't know if my heart was still or if it was beating, because it was my first time actually thinking about my heart.
Did it beat while I was around this person, or did it never beat in the first place? I knew by that point of time (it was three years after I met this friend of mine) that my heart wasn't beating, but I still wondered if it did beat during the days while I hung out with them before.
Because I wondered if it would only beat when I started to be with someone long enough, as I knew it didn't exactly beat when I first met someone, I wondered if maybe being in a relationship long enough that it would cause my heart to beat. I thought I told my partner that information when we first got together. At least they know know.
Can confirm, it did not. My heart still doesn't beat. I'm okay with this. I've always been okay with learning if these things happen or not. It's likely that my heart didn't beat back then, and I'm okay with it. After all, I still care for others, including that partner of mine, even if my heart doesn't beat.