Trust is something that is considered the Most Crucial thing in a Relationship. When Trust is Broken, that is the beginning of a crush on the relationship. There is nothing worth more to be taken into careful consideration like trust.
Building Trust is a journey, it is not a one time thing as most people think. The time you take knowing your partner is building that trust. Making sure that you know your partner well enough is the beginning of Building your Trust. There should not be any withdrawal or holding of information between the two people in a relationship or marriage.
As the saying goes, Trust is Earned. The more effort you put to let your partner know more about you, the more your partner will trust you. Make sure that you are not doing anything that will reduce the trust. For example engaging in anything that you were not doing before, the simple little things. Not picking up the calls, not replying as often as you were, not making time to meet. As this may occur because of unavoidable circumstance, for example the work life or education just got too tedious, it is always important to have that communication prior. Tell your partner the new changes that have occurred and make sure they are aware of the possible timelines; how long this will take place.
Have difficult but important conversations with your partner. This is to make sure that you two are on the same page. Ask him or her about Cheating. Has he or she ever Cheated on another Partner before? how was it handled? Ask him or her about Finances. Would the person disclose how much he or she actually earns and how he or she spends the money? The answers to these questions will help you see the type of person you are with and make sure that you are on the right page.
Building Trust in a Relationship or Marriage is not difficult, but it is also not easy. You should have clicked and synced before. Love should be the dominating factor here. If you really love him or her, you will surely want them to trust you.