Some relationships survive because one person keeps forgetting what the other keeps proving.

Some relationships continue only because one person keeps resetting the record. Each incident is treated as isolated, the history is not consulted, and so the same lesson never gets learned no matter how many times it is taught. That forgetting usually comes from hope rather than foolishness, which is why it is so hard to stop. It is also what allows the pattern to continue indefinitely.

Try writing things down when they happen, briefly and without drama. Not to build a case, but to keep an accurate memory that hope cannot edit. Then make your decisions from the record rather than from the most recent good week.