There's a piece of advice that is thrown when talking about forming and maintaining a long, stable relationship: dependency.

The rationale comes from observing that relying on someone creates a strong bond with that person.

There's a problem that comes with dependency, it is not sustainable, a person can't be always dependent on his/her partner, independence is bound to happen eventually.

If a relationship was born from dependency, then the inevitable independence will break it.

Example from personal experience:

-A friend of mine (male) formed a relationship with a woman.

-She was kicked out of her parents house.

-My friend takes her into his home (this is when the dependency came into question).

-She has no money, no friends, nor family.

-My friend buys her a car.

-She then gets a job.

-Slowly she moves out of his house.

-Then finally when she has acquire enough independence, and no longer needs him, she breaks the relationship.

In this example there isn't any other external force for the separation beyond the first stage dependency and then subsequent independence.

The relationship wasn't toxic, there was no physical or verbal abuse.

My friend was the one doing the house chores (cleaning, cooking).

Sex wan't a requirement nor the reason for the split-up.

I don't think there was any cultural reasons for the break-up (My friend and his ex are not from the U.S. just FYI)

Conclusion: any relationship built on dependency is inherently unstable, and independence becomes a force of chaos once introduced into said relationship.

Discuss.