He didn't like it, he was on a mission to burn every bridge there was. The first time he left, the transfer went a bit too smoothly. Inter didn't put up much resistance and the fans still respected him. So he just had to come back, to ensure the bridge was burnt for good this time.
Chelsea was yet another victim, the sold him too easily, 35m and he was gone to Everton. No one made a fuss about that transfer and Chelsea fans would still welcome him back, and so they did. Naturally, Lukaku didn't like it either. Fucking bridge had to burnt. The orbital atomic warhead that was the Gazetta interview didn't leave anything to chances, bridge of stamford was completely disintegrated.
But he has not done yet, Anderlecht and Everton must not be spared. Only until the last bridge turns ashes, Lukaku will finally find peace. In the end, the only club who may escape this fate is West Brom, who has relegated themselves to the Championship just to hide from the wraith of Lukaku, who now is become a pain in the ass, the destroyer of bridges.