I agree with Scooter, show him what you posted here. Because your emotions are all over the place at the moment it can be hard to communicate your feelings to him in an effective way (although I do think that this is easier once you've got all the (to quote Scooter) "you're a bastard" shouting over with.
I am the wife of a porn addict so I can completely relate to what you are going through. It would be really useful if you started a journal (found in the partners section of this forum), you can then use it to get support from other partners of addicts, keep track of your feelings amongst other benefits.
I would also echo the suggestion that you encourage your boyfriend to join this site and get help with his addiction.
Aeris
(an internet hug, because you deserve the biggest hug at the moment, but obviously I can't teleport!)