Pretty interesting, I didn't even know this was a rumor.
Yeah it's the new rumor going around LA for why Pau played like crap. The first was of course a wife (Kobe's) told Pau fiance I guess about his cheating and she dumped him when he found out. They said him and Kobe got into it and that caused friction in the team.
Then someone changed the story to Pau's fiance sleeping with Shannon and it happened to get out because his fiance was talking to Kobe's wife and said she was messing around on Kobe and his wife told all who could hear that she slept with Shannon. That was said to have led to an argument and almost a fight between the two. Pau is still with her. He said it in an interview and Shannon of course denied it.
That team has more drama than a freakin soap opera.