When we learn, we learn by doing a behavior, seeing the outcome and seeing if the outcome is what we hoped. If the outcome is not what we hoped, we try again, and hope for a different outcome. In psychology, this is called "repeat until resolved".
In toxic relationships, this inherent form of learning becomes self destructive.
You do not *have* to repeat it. It will not resolve. All you need to do is accept that a lack of resolution is resolution in and of itself. When that acceptance happens, you may find that you no longer feel the need to be drawn in to the repeat cycle anymore.