For me, infidelity is when my husband has sex with another woman. That wasn't an option to vote for. I don't know what all he does online (beyond being addicted to pornography), but it is "infidelity" to me that he is screwing other women. I think I would be a lot less upset about the situation if I found out he only had an online correspondence rather than a physical relationship. That said, even without the infidelity, it was still very hurtful to me that he watched so much pornography. I wouldn't call that "infidelity" but it was hurtful.