What we need to do..and I know its hard to so (this not directed at anyone in particular) is to try to remember that no one person loves the same at least in reference to different people. From what I can gather both Alia and Noor had different personalities, qualities, etc so of course Hussein couldn't or wouldn't have the same type of love for these women.
What's also important to remember is that Alia (due to her tragic death at such at young age) is always going to be frozen in time. The love that Hussein felt for her (as well as their three children growing up without their mother) is always going to remembered with a thought of....What could have been? And there always be beautiful memories. Not to take anything away from their marriage....but who knows what could have happened if she stayed alive. Not to arouse those who love and miss Queen Alia (and also to try to get back on to topic) but for all we know...it might have ended at some point. Don't forget...he loved Dina and Muna deeply as well at one time.
Just a thought.