Kurt Angle has reportedly upset Triple H with the way in which he handled inquiries about returning to WWE according to Mark Madden and numerous other sources.
Angle is reported to have first called Triple H but was pretty much blown off. Angle then called Vince McMahon who told him that Triple H makes the talent decisions now.
Triple H was upset in the way Angle went over his head.
Angle was granted an early release from his WWE contract in August of 2006 because of health reasons. He later claimed WWE wouldn't give him the time off, so he quit. Two months later Angle joined rival promotion TNA Wrestling.