Trust is important in order to have a successful and healthy. It is easy to get caught up in insecurities and doubt and it ultimately ruins a relationship, we all wish we could have a book that told us how to have a perfect marriage but that is just not possible to have a PERFECT marriage and the sooner you realized that we are all human the better you are at forgiving and trusting that your mate loves and honors your marriage vows. The first thing that has to happen is your wife has to be consistent in her actions and her words have to match her actions this is what is making you doubt and not trust her. Her being reliable on a day to day basis is very important she needs to be where she says she is going to be and be completely honest with you about her whereabouts and it will help build the trust.
Communication is also important in your marriage you have to tell her how you feel about things without sounding insecure and she has to tell you how she feels and not feel like she has to hide anything from you. How you deliver your intended message to your wife and how she to you could be the reason for some of the insecurity. Most disagreements in a relationship occur due to a misunderstanding. You and your wife need to be able to trust each other's words, to have complete faith in each other. Have your words match your body language, when you say what you mean and mean what you say the trust will follow.
Believing in yourself seems to be the issue you have issues believing that you deserve to be loved because you may feel like your birth parent threw you away and didn't want you, you felt abandoned and you may have a fear of people leaving you, because of how your family life was growing up and being adopted and your past relationship, along the lines you were hurt by someone and are afraid to feel that hurt again, believing in your partner and in each other as human beings is crucial to a relationship and trust. This is definitely something that your wife should know, you cannot build trust in a relationship if you are keeping secrets. Secrecy of any kind will destroy the trust in a relationship. Being honest and open can seem basic and easy but it requires intention. Keeping a secret puts barrier between you and your wife. Secrets sometimes requires lies and more lies to cover the other lies. No matter how difficult it may seem, an honest and open relationship will always be a trusting relationship even if you mate doesn't like the truth.
You always have room for improvement so if you are insecure or have self esteem issues it's a must to try to continue to grow and stretch as a human being and work on your issues. By continually bettering yourself and work on your issues the trust will come in time. If need be try going to counseling alone to figure out why you have trust issues and what event in your life got you to this point and tools you can use to trust not only your wife but that your marriage is genuine and that you deserve to be loved and wanted.