In another Insight, "How many serious ruptures" I summarised the basis for building trust as a couple.
Firstly, you consistently turn towards opportunities to connect with your partner.
Secondly, you acknowledge and talk about any feelings of unhappiness with your partner.
And thirdly, you consistently see your partner in a favourable light. That is, you cultivate a benevolent perspective, where you interpret your partner kindly.
Here in this Insight I give much more detail about how trust is gradually and consistently built over time. (Trust can also be eroded over time, but that is not the perspective I am taking here.)
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