Remember that you can be considerate and strong at the same time. Be your own person, show that you have your own beliefs and motivation and direction. If you say you will do something, then do it. Give them some slack if it is due, but make a point of the failure with them. Following through on your word is the greatest form of communication that we have when dealing with other people.
Word are easy.
Often they are too easy. If your partner respects you, and you are a priority with them, then they will let you know by following through on their word. Consider it a way to distinguish yourself in all areas of your life, including your dating life.