If your not truely interested, then why continue to deal with a Person???

Today I awoke with so much on my mind...I got on the phone with my "Bestie" and we started sharing stories of  staying in an unhealthy or unhappy relationship.  They complain about the person, fight with the person, know in their mind that they have NO intention on marrying or even trying to have a family with the person, basically in their heart of hearts....they are not interested.

So what makes a person continue to stay around?   Is it that, they are using them? Do they feel that they will not be able to find another with the qualities that the person whom they're with has? Is it that they're at the point to where they are just tired of the dating process? Whatever the reason, I feel that a lot of unhappiness would be prevented if people recognized in the beginning that the person whom they are with is not what the want.  And, that they should let go and move on so that they can experience true happiness otherwise you waste the life that has been given to you on another human being.

In the end, why go through the nonsense when you REALLY don't have to?