Well, Fornell said 'we're an hour late' and it looked like he just got to Gibbs' house, so maybe he actually went to the wedding, gave away the bride and left?!
Thats true and I've thought about it and he was talking about all the good things about his ex wife like he missed her or something so maybe he said that saying he gave up his chance to be with her again...
My mom and I think that he meant that when she got married, he gave her away...like he doesn't have to worry about her anymore...she was Gibbs' ex then Fornell's...I think her name is Diana