As a lone wolf I totally disagree.

I think that we are engineered to have sexual and romantic partners by default. And there are some, like me, that somehow we can live without one and not fall into addiction traps ( drugs, party, videogames... ).

But we all have friends ( most ) that are not like this, the difference for most of them between being single or not is big, and I don’t agree that they are depressed its just human nature.