Here is the link to a great article from LDS Living: http://www.ldslivingonline.com/story1.php?aid=738
Here is a piece of what I really liked from it, but there is a lot of great stuff in there!
So how do we get that testimony of our marriages? A few things can help.
First, realize that it may take time. How long did it take for you to get a testimony of the Church, even if you were raised in it? Give it time and patience and commitment.
Second, pray for your husband specifically and daily. This will add a level of commitment that you may not have felt before. As you seek our Heavenly Father’s divine blessings to flow upon your husband, you will be inspired to assist in that process and be a blessing to your husband. Your loyalty and devotion to him will increase.
Third, ask your Heavenly Father for this testimony. Again, be patient with the answer. It took me a long time to get there. It had absolutely nothing to do with my husband and everything to do with me. Patiently go through the lessons and experiences the Lord places in your life to get you where you need to be to receive it.
Finally, perform sealings in the temple and listen to the promises and blessings. Also, initiatories invite you to hear your blessings in your own capacity as a wife. These will help you see the eternal importance and value of your eternal relationship. Understanding and love and commitment will distill upon your soul as you do this.