to put it simply, he's gotten to comfortable with the relationship and yourself. he's being himself and you're realizing that this isn't the same person who he was when you first met him.
i think that you should be honest with him. the two of you will probably get into a fight or huge disscussion about your differences but if the two of you are willing to actually take the time and settle this, then you know he is one that you should keep. if he's not willing to see things from your point of view, then maybe it's time to move on. keep an open mind and state your points. listen to what he has to say but be strong of what you want to say. accept his ideas but present your own. raverboy
...this is just my perspective on the situation...