Independence is strongest when interdependence remains voluntary.

Depending on each other is only healthy while both people could, in principle, manage otherwise. Then the mutual reliance is a choice being made again and again, and it stays warm. Once one side genuinely cannot leave, the same arrangement becomes something else, however affectionate it looks from outside.

In the relationships that matter to you, check that both people retain their own footing, financially, socially, practically. Not because you expect to leave, but because the freedom is what keeps the closeness voluntary. Support the other person’s independence, and let them support yours.