Men will always watch porn. It doesn't matter if they are having sex with 20 hot girls every day who are slaves to his every desire and whim, they will still look at porn. It doesn't reflect at you in the slightest. It's just something you will have to deal with. It is in no way a betrayal of you, or a desire to look at "other women", its just a masturbation aid. If it bothers you that much, why don't you make some movies with him, then he will have "confusedbyitall porn" and everybody wins.