Trust is one of the important building blocks of a relationship. While your partner needs to hear that she can trust you, it is just as important, if not even more so, that she sees that your words have meaning. Your words will have no substance if you do not prove them to be reliable by being consistent in your actions.

Say What Is True

Tell your girlfriend the truth. Besides lying, withholding information is another form of deceit. For example, if you know that your girl is uncomfortable when you hang out with a certain group of friends because she feels that they have a negative influence on you, tell her that you ran into them and hung out for a little while, instead of deciding to hide the truth from her. Being truthful is imperative for building trust in romantic relationships.

Say You Are Sorry

When you mess up and make mistakes, be ready to admit that you did or said something wrong. This is a step to showing her you are aware that you are not perfect; you admit to having faults. This is not always an easy thing to do. Take responsibility for your actions. If you have to apologize, make sure you really mean it and are truly sorry. When you apologize, clearly state what it was that you did wrong, show that you regret it, say you are sorry, empathize with her and ask for forgiveness, suggests psychologist Guy Winch, in the article, “The Five Ingredients of an Effective Apology,” on "Psychology Today" online. For example, “I am sorry that I made you late for the concert. I should have started getting ready sooner. I messed up. I know how much you wanted to see the opening segment. Please forgive me.”

Say What Is Important to You

Tell your girlfriend your secrets. One of the risks you take in falling in love and getting involved in romantic relationships is making yourself vulnerable. Be comfortable in telling your girl your secrets. Share your deep desires, your dreams and your plans. Talk about some of your embarrassing moments or those times when you felt most afraid or alone. The more you share with your girlfriend the closer she is likely to feel to you and the more likely she may be to open up herself to you in return.

Back It Up With Actions

Be consistent in what you say and do. Your girlfriend is more likely to trust you if she sees that your actions match your words. Do what you say you will. Show up when you say you will. Ensure that she can trust you to keep her secrets. She should feel secure with you if she knows you will not spread rumors or lies about her nor talk about the personal information she shares with you. Your actions -- in combination with the things you tell your girl -- will strengthen the trust in your relationship.