When it comes to love, we should never say never. It is a fact of life that most of us do things we said we'd never do. We don't do things we always promised we would. Life is uncertain. That uncertainty will invade your marriage at some point. That doesn't mean you should question your marriage. Rather, you should rethink your position in the marriage and make sure you are still putting in as much or more than you expect to receive.
Never say what you won't do. When you love your mate, you will learn to do the things that the mate loves to do, or at the very least appreciate it. Don't make 100% guaranteed promises when you don't know what's up the road. Make positive declarations, but know that times will come when you miss the mark you aimed for. Then, neither party is devastated by shortcomings.