Tiger Woods' alleged mistress claims she was lying when she said she did not have an affair with Tiger Woods ... and sources tell TMZ the fight at Tiger's home the morning of the crash was triggered by a series of text messages between Tiger and the woman. Rachel Uchitel has publicly denied she had sexual relations with Tiger Woods, but we've learned she has said she did indeed have an affair with the golfer. And, we're told it was her -- not Jaimee Grubbs -- who caused an argument between Tiger and his wife, Elin Nordegren, that immediately preceded...