It is good to see that most of the people here are not telling you to change the way you feel about this(take a look at some of the other questions about porn.. Crikey!). Many women feel the way you do. When they enter a relationship, they want to be the one that their husband thinks of sexually, they do not want to have to worry about him constantly looking at, or fantasizing about other women. For many women, this is cheating. Period. There is no "oh get over it", or "that's the way men are". They want to know that they are enough for their mate. I think that when you said that he does not care that much about your feelings, you hit the nail right on the head. The definition of addiction (any kind, but here we are talking about porn addiction), is that it becomes unmanageable and that it has a negative impact financially, in relationship and professionally.
I agree with others here about the necessity for you to get into counseling for you.
Good Luck!
Elena