This truly has nothing to do with you and the first step is to really really believe that. That doesn't mean your discovery about your husband's porn addiction will not hurt like crazy and possibly even drive you crazy. It takes a while to let it sink in and realize that it is an addiction and not something he can just quit even if he wanted to. Whether to stay or leave....it depends on whether the two of you can talk about this issue in an open manner, addressing it as the big issue that it is. Unfortunately along with the addiction come certain ' traits'....like denial, blame, anger, not listening, not keeping promises, defense mechanisms etc. THAT is the added problem. Living with an addict ( of any kind ) who does not see the enormity of the issue or the impact it has on those around him is more than frustrating. It hurts. It drains you. It causes relentless constant tension. I can't tell you what to do as no 2 people are the same, but I can tell you that if he doesn't get help ( for himself and for your relationship ) , then think very carefully about what it is you need from a relationship and where you cannot compromise. Short term hurt is better than years of pain.