In this dream we had to be matched with our corresponding tritones, so that if I was a G, for example, I had to have as a partner a D flat. It wasn't a sexual or romantic thing it all, just a matter of finding someone complementary in some way to work with on some project. It was also unclear what made someone a particular note.
While the tritone can seem dissident, it is present in diminished and dominant 7 chords. So the 3rd and seventh in a dominant chord will be a tritone, and the tonic and fifth, and third and 7th, will be tritones in the half diminished.
It is not true, by the way, the it is "the devil in music" in the Middle Ages. That designation dates from the 18th century. I don't think they would have forbade this interval because it is devilish, but simply not used it because Western harmony had not developed a use for it yet.