Let me speak from experience: If there is no holiness in your life, you will get bored/sick/frustrated with your wife no matter how beautiful she is. If you think that had you married the "ditz" you wouldn't be looking at other women, then you are dead wrong. As a human, but especially as a lust addict, you will ALWAYS be hungry for more. Whether your wife is hot as H* or not, it makes no difference at all.
About three weeks ago, while in the middle of surfing for p**n, when that night my very beautiful wife was going to the mikva, I came upon this site and I said to myself, "I am not an animal". I wanted to regain some form of Jewish dignity.
Whether you are currently in a healthy, long lasting marriage, I don't know. But I do know that (1) you will NEVER be able to tell until you rid yourself of this addiction and (2) your addiction will NEVER EVER make your life better, and will absolutely never make you happier, and it certainly won't convert your relationship into one that is a healthy long-lasting relationship.
Keep fighting!