Trust can be rebuilt after betrayal.
That sentence needs a second sentence.
It is not guaranteed.
Some couples create a relationship after betrayal that is more honest than the one they had before. Others spend years calling the relationship "healing" while secrecy, resentment and fear remain in place.
The difference is not how intensely someone apologises.
It is what both people do with the truth afterward.
Trust is not a decision you make once
The betrayed person is often told to decide whether they forgive.
Forgiveness and trust are different.
You can decide not to live in constant revenge.