Something changed when Q first meet the crew of the Enterprise. He was there juge. As it turned out they had stubbornness to mach his own, over time he came to care and like the human race. Not that he would ever admit it. He cared about Picard. The humans taught him about free will and with this knowledge he helped start a civil war. He had a son, a human is the godparent. Humans changed his life as much if not more than he had for there race.