Does it as a F/o if your not romantically attracted to em?

I got a bitch I can't stop thinking about but I feel no romantic attraction either, if anything I ship em with an oc if anything. But I do think I have a strong attachment going on since I don't want to abandon the world I made for them in my mind, I have so many headcanons too since they are a bit incomplete in canon. I feel like I'm betraying them if I think about them with another girl too lol. I also fear my ocd will ruin this character since I had obsessions with characters get ruined by anxieties. There's something there, just not a massive crush, but I do still like the version of the character I made a lot and they pop up in my head a lot. Can a character you don't have a crush on still be a f/o?