Its not about Romelu Lukaku happy or not with Inter Milan but Chelsea can controlling what the future team for Lukaku, last rumor Chelsea want to sell Lukaku for Saudi Pro League team but Lukaku want to stay for playing with European teams. I think Inter Milan has offering higher bid than Saudi Pro League team if want to make Lukaku keep staying, for loan option seems impossible for Inter Milan and Chelsea want to get much money after selling many player to Saudi Pro League team.
Crucial situation what happen for Lukaku, one side he want stay and play with European teams between back to Chelsea or extend with Inter, but Chelsea want to sell him to Saudi Pro League teams.
al hilal is reported to have a very high interest in Lukaku but apart from al hilal, ac milan is also reported to have a fairly high interest in Lukaku, it looks like Lukaku's current position is very unfavorable. Chelsea's management now seems to really want to make big money from selling it, as long as it's still under contract, Chelsea has a big hand in selling Lukaku to whichever team drops the highest bid. let's see how far Lukaku struggles for his future in the European league (he really doesn't have a big interest in playing in the SPL).