What makes Jeff the perfect man for Allegra in the novel, The Wedding?

Jeff is exactly the kind of man Allegra wanted. He takes a deep interest in her and what she does, something Brandon never really bothered to do. He puts Allegra first and is willing to make sacrifices, both small and large, to make her happy. Although he wants to spend every moment with her, Jeff understands how important Allegra's work is to her, and unlike Brandon, he does not make her feel guilty for helping out her clients when they are in need, even though the calls may come in at 1:45 a.m.