What did Pat whisper into Nikki's ear after the dance?

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I assumed that he apologized for everything and told her was ready for a divorce. She seemed to have a look of acceptance and a little sadness when he pulled away.

judging by her reaction i'd say something along the lines of
"im in love with Tiffany now, she has slept with a whole office and still not as big a whore as you"

He actually starts of by not saying anything, but rather flickers his tongue inside her ear making her all hot. By the very last clip - before nodding goodbye - he wispers: "I saw how tiny he was in the shower. Enjoy..."

He whispered, I am ashamed to be an Eagles fan.

http://www.imdb.com/name/nm2604794/

"I finally accepted the fact that I married a whore that bangs other men in our home while listening to our wedding song. Go f*$# yourself, bitch."

He said:

"Hey, I was just thinking. Why don't you, me, and that cute young hottie I just got thru dancing with do a threesome at your place?"

I imagine that he apologized for beating the crap out of the other professor with tenure. He also said that this was probably a blessing in disguise a silver lining, because they probably weren't meant to be together. If he were reading the signs, he'd have to say that this whole experience was the best thing that could have happened for them because they weren't meant to be together. He'll always care for her, he wishes her the best, and this is goodbye.

Again totally my imagination but I think he said something along those lines. With the time lapse I think he was whispering in her ear for a short while. Maybe a full minute or two. She looked a little surprised and just a tad disappointed; like she was actually ready to forgive him. But they weren't meant to be together because she didn't look bothered enough that he left her to go chase Tiffany.