If you look at the facts, he signed a new contract with the league champions and within a few weeks resigned and came to us. This questions his loyalty. Also he has just left the league champions as they are about to start the campaign in the Champions League.
Now, most people want to compete in that elite competition for the glory, but he's turned his back on that for the money.
I accept it, he's a mercenary like Koeman and if someone offers them a huge wage increase they will be out the door in a flash. As long as they do a good job, that's all that matters in the end.