Even if none of that's the case, why is it that you think your marriage is what should make you feel fulfilled? It's not your wife's job to make you feel that way. It's not your marriage's job either. Your wife is your wife because you love her and want to spend the rest of your life with her. Your marriage is a marriage because that bond and commitment was/is important to you to show the world you love and cherish your wife, and your family. Neither of those things exist for your fulfillment. Love isn't' about you. Neither is commitment.
Love is a choice, one that you must make everyday.
And sometimes doing nothing is a choice and an action. (even if it seems like its an inaction)