From Robin's diary:

Love or Friendship

I tried to reassure Uncle Mac that there’s nothing going on between Maxie and Spinelli, but he’s still not convinced. He’s concerned for Maxie’s safety, and he doesn’t want to lose her like he did Georgie. Maxie told me that she and Spinelli are just friends, but I think their relationship is developing into something more. Of course, I didn’t tell Uncle Mac about my theory because he would’ve gone off the rails. I love Uncle Mac dearly, but he does have a tendency to overreact. Besides, Maxie could do a whole lot worse than fall in love with Spinelli.

http://www.drrobinscorpio.com/2008/05/love-or-friends.html