A player that does not receive confidence from his team, performs less. That is a known fact.
In stead of always saying bad things about him, we should be glad that we have at least one player of high quality in our wallet.
What I have learned from the Champions league final is that when Lukaku came on the pitch, Inter started to create chances. The blocking fase was not his fault and the header, it was on the goalkeeper but he had not much time either.
My advice, cheer for him, believe in him and we should be begging on our knees that he comes back to us. I mean, not like much happened at us this season without Lukaku. It can only get better. Attract some new players that can work for him. He must feel welcome also for him it is not nice that some other players in the Premier league gains more then he. This could also be a offer of Chelsea towards him for even better performances.