We all have restlessness in long-term relationships.

Relationships have to have a give and take if they're going to work in the long term.

Romantic love allows you to focus mating energy. Attachment sustains that relationship as long as necessary to raise your baby.

...their relationship was a point of near-constant discussion in Night Vale, all of their imperfections and faults, which made them individuals worth loving. They had built those faults into the usual messy, comfortable, patched-up, beautiful structure that any functioning long-term relationship ended up being.

When you honor your true inner desires, and don’t become sexually involved when you don’t really want it, you have the control of your love life and you are at peace
and harmony with yourself.

The result of long-term relationships is better and better quality, and lower and lower costs.