how can someone gain someone else’s trust back?

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After certain situations no matter what they may be, whether it’s towards a friend an ex relationship a current relationship etc. What are some ways a person can gain back someone else’s trust? What are a few methods that they can take? Is there certain ways? Is there a scheduled routine? What are some ways that have worked out for y’all? This goes for any type of scenario that took place that made someone lose someone else’s trust.