Passion or partnership

When people are considering a relationship for the long haul, what takes priority? Are you considering how the person makes you feel or their ability to manage and maintain a life and its responsibilities? What drives your decisions?

If you have the person who is able to maintain life but provides you no passion, excitement, or fulfillment, does it work?

What if they provide the passion but lack the ability to maintain responsibilities?

What do you really need from a mate to be considered in a good and solid relationship? And is there a such thing as fulfillment in a relationship?