Whenever stress is involved in a decision making process, look at the whole scenerio as logical as possible. Emotion and logic are enemies to one another. The battle can be fierce. What emotion are you feeling most now? Jealous? Insecure? Angry? Betrayed? Sad? Confused? Bewildered? Put in what you are feeling. If its saddness and betrayal, look at if you usually go to those emotions when you get scared.
We all resort to familiararity when we are scared.
The thing that would bother me the most, and it has because I have lived what you are living for over 5 years, is the blatent lies to the face when they are confronted with the fact that what they are spending their time on, is somehow making you feel uneasy. This needs to be able to be discussed. Not pushed under the rug, denied, made to be your problem, or his. Sex to many people is an act of entertainment, lust, addiction, perversion, something that needs to be maniuplated to, lied about, done in secrecy, fantasy, illusion, and deception.
To others, sex is co mingling, intimate experience, vulnerability, passion, sharing, exploring, relaxing, being excited, but it is done with the head of person attached, not just the body and its vital organs. Either way is ok as long as it doesn't hurt someone. In this case, it is hurting you on an emotional level. It is difficult to love and respect and cherish someone when they tell you that they are balancing a checkbook, but in the meantime, eh um........:) you know.
If he is as successful as you say, and I believe he is, then he will be able to have a decent, intelligent conversation with you on this topic. If you both can't walk away with some semblance of commonality, I would say go for the annullment now. Save yourself some good years. If you are able to start the process of discussion, something that is crucial to all successful and good and loving marriages, then stick around. You might have found the man of your life, and he found his.
I would give him the 7 days to try to figure out not why he looks at porn, but why he is able to look you in the face and lie likes its nothing. My (ex) husband did this to me one too many times. After a while....who is the jerk?????!!!!! Kimi