Maybe it's a cliché, but it really seems to me rarely somebody does. Not "mature and adult" people anyway. Except for spouse, maybe. Maybe.
Why? Well, understanding implies there is something to understand, that implies feelings, generally. Big thoughts, sincere troubles. And "mature and adult" people are not about feelings, they are about business. They don't show their feelings and don't put their nose into others'. Especially in western, "civilized" countries: you are supposed to smile, you are supposed to be happy…ish. Everybody knows that "we don't need toxic people in our company", right? If you don't sport bright fake smile that's already "gloom", maybe impolitely so.
And now, with facebook and stuff everybody you need to speak occasionally to is a "friend". And I don't really mean it in a bad way (well, maybe a little I do): "friend" is just a word, it means what people mean by it, not what some psychologist (or even a dictionary) defines it to be.
So maybe you just need to use another word to suit this definition. I mean, if you say you don't have a "soulmate" it doesn't sound as surprising, right? Maybe sad, but not surprising, really.
