Borrowed trust gets paid back with interest. Expect to prove it more than you broke it.

Restoring confidence costs more than losing it did, which feels unfair and is how the arithmetic works. One breach makes every future statement a question, so the repair has to cover the original event and all the doubt that grew afterwards. Expecting a quick return to normal is usually what causes the second failure.

Settle in for a longer stretch than feels proportionate, and stop asking whether you are forgiven yet. Do the reliable thing repeatedly without drawing attention to it. The point where it stops feeling like a performance is usually when the other person starts to relax.