Background: Paul Michael Levesque was born in Nashua, New Hampshire on July 27, 1969. He has a sister named Lynn. Levesque watched his first wrestling match, involving Chief Jay Strongbow, when he was five years old. He attended Nashua South High School, where he played baseball and basketball.
Context: Although Triple H failed to win the Royal Rumble match at the Royal Rumble, another championship opportunity arose for him in the Road to WrestleMania Tournament. He won the tournament, granting him a match for the WWE Championship at WrestleMania 22, where Triple H and John Cena fought in the main event for the title, which Triple H lost via submission. Later that month at Backlash, Triple H was involved in another WWE Championship match, fighting Edge and Cena in a triple threat match, where he lost again. Angered at his loss, a bloodied Triple H used his sledgehammer to attack both Edge and Cena and then performed a number of DX crotch chops. Triple H unsuccessfully attempted to win the WWE title from Cena on numerous occasions, blaming his shortcomings on Vince McMahon, which eventually led to a feud between the McMahons and Triple H.  Shawn Michaels returned on the June 12 episode of Raw and soon reunited with Triple H to re-form D-Generation X, turning Triple H into a fan favorite once again for the first time since 2002. DX defeated The Spirit Squad at Vengeance in a 5-on-2 handicap match. They continued their feud with Mr. McMahon, Shane McMahon and The Spirit Squad for several weeks. They then defeated The Spirit Squad again on the July 18, 2006 episode of Saturday Night's Main Event in a 5-on-2 elimination match. They then again defeated the McMahons at SummerSlam, withstanding the attack of several wrestlers who assaulted them before the match as directed by Mr. McMahon. At Unforgiven, D-Generation X then defeated the McMahons and ECW World Champion Big Show in a 3-on-2 handicap Hell in a Cell match. During the match, DX embarrassed Vince by shoving his face in between Big Show's buttocks, and DX won when Triple H broke a sledgehammer over the shoulders of Mr. McMahon after Michaels performed a Sweet Chin Music on him.  At Cyber Sunday during DX's feud with Rated-RKO, special guest referee Eric Bischoff allowed the illegal use of a weapon to give Rated-RKO the win. At Survivor Series, DX got their revenge when their team defeated Edge and Orton's team in a clean sweep during their five-on-five elimination match. In January 2007, at New Year's Revolution, DX and Rated-RKO fought to a no contest after Triple H suffered a legitimate torn right quadriceps (similar to the one he suffered in 2001 in his other leg) 15 minutes into the match. Surgery was successfully performed on January 9, 2007 by Dr. James Andrews.
Question: why did he initially leave?

Answer: