I think he lost the last bit of motivation and hope that he had when was kicked out by Pardew. I truly believe that IF he hadn't been dropped those times where he didn't deserve to he would have continued to show that he's worth having in the team every week for his offensive quality. But we know that Pardew prefers graft before skill. I genuinely think Hatem loved it here but he never really got the support or arm around his shoulder that was needed. Hatem isn't blameless, of course not. But he's been badly treated imo. Now he simply has no motivation or hunger.