What according to you is the binding factor of a relationship?

Two people are never gonna be the same. That's a fact. There will be differences. However, what is the key factor according to you that despite all the differences and arguments, still keeps the relationship together?

I'm also not talking about a husband/wife, boyfriend/girlfriend relationship only. If you have the time and intellect to answer for the blood relations as well like that of parents and children, would really appreciate it.

What according to you is the binding factor of a relationship?
What according to you is the binding factor of a relationship?
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