A system is composed of elements that can interact with each other by any means set.
Each one can have his/her very own system(s). An example of such a thing would be a system of thinking.
More than one individuals can also agree to create systems and set rules for them. Examples of systems could be a couple’\s home decoration, a political system, a religion.
What exists for one system doesn’t necessarily exist for another. Similarly, truths, lies, rights, wrongs, importances, wins and loses can be set to be valid for a system without that having any impact on another system.
However, it is possible to agree to be part of different systems simultaneously, which can create problems, confusions, particularly when those systems contradict each other. One can do that so much and so often that he can ‘lose himself’ in other’s systems.
The creator(s) of a systems is the inherent master of that system. And by entering another’s system you can automatically become subjected to it, while you could otherwise have complete freedom to create (or not), change and destroy your own.
A very basic lie, delusion in life is that there is one system that is one and the same and the right one for all. That automatically puts every believer’s systems to adhere to that system, for as long as they believe it. That puts them under control.
It is easy to be believed as that notion is somewhat similar to another notion, that each person is the whole. But ‘being the whole’ and ‘all being part of one systems’ are not the thing(s).
For that reason it is adviced for each one to hold on to his own system(s) and to connect to other’s (or not) at will, and the same stands for couples and for groups too. And that is called integrity.
There can be individual intergrity, but -given free consent- that intergrity can expand to couples and to groups too. And why would such a thing ever go bad unless it violates it’s own intergrity and/or respects the intergrity of others? And why would ever be any reason for a fight?