You need to do more than just not look at porn and you need to think about this as a life change rather than a 3-month hiatus. Take stock of your life and think about what are the things that drive you to porn in the first place. Start working on those things. Also, you need to look at this as a serious addiction. Just like any other addiction, there are ways to beat it but secrecy is never one of them. Porn feeds on secrecy, it build shame which is isolating, which just perpetuates the entire cycle. I would encourage you, in addition to this forum, join some sort of group whether a 12 step or something else. Find a way to connect with other addicts. It is very rare to see an addict successfully overcome a serious addiction all alone.
As a partner, I would also encourage you to be honest with your wife. That is your decision and you have to right to do whatever you like but most of the partners would agree that the lying is the worst part. The sooner you come to her and tell her you are hurting the better. Way better than her finding out on her own. She can add to your recovery in so many ways and you can begin to heal a marriage that is probably more broken than you realize. It is hard, and I imagine super scary but worth it. Most women feel hurt, lots of it, but if the partner is coming to them then they usually don't leave. I sure wish my husband had come to me. That is what partners are, right?
Whatever you choose, I wish you the very best! Keep focused.