How very simplistic to only see relationships in such a short range. And while romance may be deep for you, someone else may see a different type of relationship as being deeper than romance.
Don't misunderstand me, I am not saying that friendship isn't important. It is very important. But once again if you become Romantically involved with someone and there is intimacy then you normally become even closer. So you move away from a platonic relationship to the next level
You've had friends that were more important than people you've dated in the past right? It's a spectrum.