I dont think you are over reacting at all. I think most men look at internet pornography and women have ben know to look too. It becomes a problem if he does it all of the time. As for him blatently looking at other women when hes with you shows a great lack of consideration for your feelings. It is making you unhappy and I can understand why you would be. You need to face this head on and discuss it fully. Tell him how unhappy this is making you feel.

Gez