Youkilis and Enza split up

                                        Kevin Youkilis and Enza Sambataro

If Sox skipper Terry Francona wonders why injured star Kevin Youkilis wants to travel with the team, here's one theory: Things aren't going so great at home for the Gold Glove first baseman. We're told Youk and Enza Sambataro have split up. Notice that we didn't call Enza his wife? A source close to Youkilis tells us the couple were never actually married, even though they held a wedding ceremony on a beach in Cabo San Lucas, Mexico in November 2008. (Guests included teammates Mike Lowell, Big Papi, and Dustin Pedroia.) Apparently, the pair didn't file the paperwork needed to make it official, and there is nothing on file at the state Registry of Vital Records and Statistics. We couldn't get Youkilis to talk about it, and Sambataro did not return our phone calls. Enza, a Newton native who famously dated Ben Affleck after his break-up with Jennifer Lopez, has stepped down as CEO of Hits for Kids, Youkilis's charity for children. We're told she also has moved out of the couple's home in Weston. Once very much in the public eye, appearing together at Sox-related events and charity functions, the couple has not been photographed together for months. They have no children together, but Enza has a son from her first marriage to Robert McGee, whose family owns several car dealerships locally. Youkilis, 31, who's out for the season with a thumb injury, is in the second year of a four-year, $40 million contract. In a 2007 story in the Globe, Sambataro, 32, talked about the pitfalls of being a baseball spouse. "It's true that baseball is 24/7 for most of these guys, and that can be very tiring on a family," she said. "There are perks to being a player's wife, but you also make a lot of family sacrifices."