Sorry without adjustments is a rerun with a sad soundtrack.

Repetition without change is a cycle with an apology attached. The words reset things briefly, the behavior returns, and the other person begins to understand that the apology is part of the pattern rather than a break in it. That understanding is what makes them stop believing you. It tends to happen quietly and before you notice.

If you have said sorry for the same thing more than twice, stop apologizing and change one condition instead. Tell them what you are changing and let them watch it happen. Words have to be the smaller half from here.