Finally someone guesses! I only gush about him like all the time! *L*
Yes you're right and here is what I put in my entry about why I love him:

I adore Spydaddy to pieces. He is the most wonderfully complex character. Because of the betrayal of his wife all his innocence and trust was lost completely. He is forever changed by that. He will live the rest of his life a broken man. Everything in his life revolves around his work as a spy and he lives his whole life stamping down all his emotions. Everything he does has to be calculated and he will do anything it takes, no matter how unethical, to do what he believes needs to be done. But his capacity to love Sydney, to put her above everything else makes him truly remarkable. This man has risked his life time and again for her. He does everything to protect Sydney even if those things make her hate him. And it truly breaks my heart how easily Sydney will believe the worst in him.