His behavior seems kinda abnormal, with his feelings changing all of a sudden.
Confused human being! It's like he can't make up his mind about what he really wants.
Last season, he made an interview to an Italian paper where he said he never wanted to come back to Chelsea. That statement makes everything even more complicated. Lukaku grew up at Chelsea, and the club means a lot to him, despite the loan or permanently transferred elsewhere. Lukaku is going through some serious confusion, and he really needs help. I wouldn't be happy see him betraying both Chelsea and Inter Milan at the same time. That would be really disappointing.
This shouldn't come as a suprise to you because as a football fan you should know that most players are good at taking shocking decisions that would get fans wondering, during the transfer windows however I understand the point your trying to make because Chelsea fc is his parent club not minding the fact that he was loaned to intermilan to reduce Chelsea's squad depth and also have a better experience, of which he did showcase himself in the previous UEFA Champions League final thereby letting the world know how good he is and how dangerous he could be to an opposition defence, starting in the top 9, that's enough reason for him to choose between any of these clubs to play for but he's still very undecisive of where he's going next, well I don't see that as a betrayal because it's a players choice to decide which club is suitable for him and wait for them to come get him.
Based on research I've discovered that the Belgian forward is refusing to attend training sessions with his parent club despite being ordered by the present head coach pochettino to do so and also intermilan have pulled out of the race of signing him but talks are currently ongoing with juventus and it is said that some juventus fans have carried out protests and are kicking against his arrival to their club.