I read some wise person on here once who wrote "You can't patch a problem with a person ". I'd add, 'not even one in lingerie '.
I don't think you sound selfish. You're just following every bit of advise that is written in a women's magazine and passed from generation of women to women for years. But that advice is kind of misinformed really, especially (but not only) where addiction is concerned.
Not only is it not going to work, it's likely to make you feel even more resentful and him feel even more inadequate.
Like someone else asked. Is he working on getting clean and on some form of recovery. If not ut would suggest that he is intending to continue as he is doing. And you might want to consider what the implications of this are for you and this relationship long term. His addiction will end up affecting a darn site more than your sex life if he continues.
We have a great friends and family area on this site, and it might be worth doubling this thread up by putting it there as well.