DON'T: Disrespect your relationship by flirting with others or sending mixed signals to them.
If you have a man or a woman in your life, act like it—even when they're not necessarily around to see it. Now, you obviously cannot stop people from coming up to you and engaging you in conversation. But, you can be very forthcoming with them in letting them know that you are in a committed relationship. This will stop you from having any misunderstandings with your partner in the future.