Initially it was this.
Since then, of all the stories I hear, the ones that are the most persuasive to me are the pretty innocuous ones that simply put them together time and time again. Traveling together while they are MIA, together in a restaurant, together in a hotel room tipping room service very well.
Almost all of these little stories are about Harry and the other guy is unknown, but when pressed for details it’s obviously Louis.
They definitely spend time together. Why are they hiding their friendship from the public?