Is this a common reason repeating patterns are so hard to break, that they are continuing to happen into the future in parallel lives simultaneously with the current life we are experiencing?

This is very much the case and will help you, as well as many others, better appreciate the time domain paradigm and its great significance and the consequences for the dynamics of life—the ups and downs, the unexpected twists and turns, and the difficulty of putting things to rest once and for all. There are many, many, times during the course of the life when the crosstalk from the parallel lives comes into play and will reawaken a prior dilemma the person thought they had overcome or healed. And yet it will start up again and cause them similar difficulty and return of symptoms, and is seen as a setback or a relapse, as the case may be, in terms of a physical or emotional problem of some kind. This is one of the factors contributing to habits and confounds their release, because the reinforcement may just keep coming and this will stir things up yet again and call for similar coping mechanisms, which may be deployed despite many previous healing sessions to erase the behavior used to compensate, which may be more destructive than helpful in many instances. It may yet again reappear because of a parallel situation that triggers the subconscious in the current incarnation and causes it to resurrect the old stratagem, for want of a better choice. And then the person will be back where they started and going through similar difficulty.