Relationships when one is in the grey zone of aromatic

[GreyRiver]

I noticed there wasn't a thread about this anywhere, and I need a place to talk. Now, I've had relationships before, all of them before I knew my place on the aromantic spectrum, so all of them were traditional romantic relationships. But now, I'm getting involved with a friend I've known for years, and I'm not entirely sure how defining this relationship will go. My friend is polyamoros (I probably spelled that wrong) and I fully support him, but not having anything defined kinda drives me nuts because I like to have things defined so I can act in an appropriate manner. I think that something more queerplatonic in nature will end up being the result despite me feeling a little bit of romantic attraction towards him at times, but I'm still kinda afraid of broaching the conversation.