For what it's worth, I am the only Orthodox Christian in my family. My entire immediate family is Roman Catholic of varying degrees of piety. My wife's entire family is Roman Catholic with varying degrees of piety. In my extended family, there are a few Greek Catholics and one born Russian Orthodox, but he is now RC after marrying my cousin. My wife is a somewhat disaffected Roman Catholic.
I became Orthodox because I believe the Orthodox Church has the fullness of faith, undiminished and untarnished from the time of the Apostles. Once I came to that conclusion, I simply had to be chrismated. Period. I spoke with my wife about it and told her what I wanted to do. She was initially somewhat despondent that I wasn't waiting for her, but she understood where I was coming from and why I felt I had to do it now.
I'm a little tired and the brain isn't working well at the moment, but somewhere in the Scriptures and in Tradition we are taught that the spouse is saved through the faith of the other because, in marriage, the husband and wife are one.
If you truly believe that the Orthodox Church is the True Faith, convert. Tell your wife how you feel and what your reasons and emotions are about the process and why you feel compelled to do so. I hope she will be as understanding as my wife, even though it is painful and frustrating for both parties. I cannot tell you how agonizing it can be to go to church on Sundays by yourself and not have your spouse present next to you. I cannot explain how empty you can feel when you are anointed on Holy Wednesday evening alone. But the Eucharist can give you the strength to do it and to be patient with your spouse and also the source of strength to be Christ-like and show the world, your spouse included, that the Kingdom of God is within you and, as St. Seraphim of Sarov noted, convert those around you through the possession of the Holy Spirit.