All three are similar but they are varying degrees of accountability and personal responsibility.
Marriage: I am testifying to commit myself and my life, both legally and spiritually, to you witnessed before God, my family, and the community.
I have a very degree of certainty in my choice.
JoP and civil union:: I am testifying to commit myself and my life legally, to you witnessed before my family, and the community.
I have a degree of certainty in my choice.
Common Law: It has worked for the last seven(?) years, I we may as well consider ourselves married. Every one accepts that we are married with out making the actual commitment to the world.
I like what has transpired. I have confidence that it will work out, but I am not willing socially, publicly testify and be held accountable to the rite of legal or spiritual marriage. I am satisfied with out further commitment.
Shacking up:She cooks, cleans, does my laundry and likes to fuck like a banshee, . . .so why not? I rarely testify that she is my girlfriend, I sometimes refer to her as my roommate.
I have limited confidence if there is future, I certainly don’t want to make commitment that will last a life time. Given time it will become CL-marriage or I can make the publicly state my intentions in the future.
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NOT meaning that any case produces more love than another.
Several traditional social factors: Honorable declaration of intent. Confidence of choice. Altruistic nature of publicly vowing dedication to another for the rest of your life.
The values of you and your choice of mate will decree what is important to you resulting in your choice.
For many people the highest honor of their life is when someone publicly states their intentions of unconditionally dedicating their life to you.