A commitment is something that you are dedicated to. If you are committed to your spouse you would not cheat no matter how great the temptation may be. A commitment to the truth means laying all the facts bare, even those which you may not want to disclose. If you make a commitment then you are expected to keep and honor it no matter what may happen in the future.
Treat her like you're still trying to win her, and that's how you'll never lose her.