Wow, I think you're being incredibly hard on yourself. You're a human male with normal urges, and almost all men at the very least look at porn. You didn't have sex with anyone else; all you did was watch some pornographic material, and I'm sorry, that is NOT cheating.

As an insecure female, I can understand why your wife would be upset, but I really think she needs to explore why she's so bizarrely disturbed by your watching porn... she's actually "repulsed" by you now? I really think she's the one with the problem, not you, but I understand that you love her and want to make her happy. Still, you two should definitely sign on for in marriage counseling, if you haven't already.