Explanation can be part of responsibility. When your decision changes another person's plans or a shared event is understood differently, facts and reasons prevent the other person from carrying uncertainty alone. “I never owe anyone an explanation” is often less a boundary than an escape from consequences.
But explanation is not an unlimited public utility. Some questions seek understanding; others open a trial with no possible acquittal. You explain why you refused, and the questioner now judges whether your reason permits refusal. You add context, and they require proof that your feeling itself was valid. Each answer becomes another document in an expanding application for the right to decide.
Who may reasonably ask depends on the relationship. Someone bearing the consequences of your choice has a stronger claim than a curious observer. Explanation also needs the possibility of response: can new information alter the other person's view or action, or have they already decided what every answer must mean?
Stopping should be as clear as possible. “I have explained what affects our shared situation.” “You may disagree, but I will not continue proving that I may make this choice.” This is different from silence used as punishment. Before stopping, ask whether facts remain missing, whether your action directly harmed the person, and whether what seems repetitive is actually an important question you have avoided.
Boundaries cannot erase responsibility, but responsibility cannot make an entire life permanently transparent. Explanation sometimes functions as an invitation to mutual revision. If only one conclusion is acceptable, the invitation has become an interrogation. Accepting that someone may misunderstand your refusal is then part of preserving a decision that is genuinely yours.
We should also notice when we demand endless reasons from others. A clear no is answered with “but what is the real reason?” because no reason counts unless it centers our needs. Understanding sometimes requires more speech; sometimes it requires accepting that speech is finished. Attention and trust are finite. They belong most fruitfully where reasons can be answered, not merely inspected.