Two
There were two of them left. Well, Boq and Nessarose were still around, but for the most part it was Fiyero and Glinda.
Not too long ago he would have had no problem with this arrangement, but now there was a hole, and try as he could he couldn't ignore it.
He thought about leaving. After all, he'd already stayed at Shiz far longer than he at at any other school in recent years. But as hard as he's taking it, Glinda's taking it even harder. So he stays, because two is better than one, and they need each other.