Still a few more lives left?

Why are we so stubborn when it comes to hanging on to obviously disintegrating relationships? Maybe it's because at least the person we're with - however wrong for us - is a known quantity and a set of raw materials to work with. If we let him go, there's no guarantee that we'll meet anyone better. Consequently, we ignore the signs that are obvious to everyone else and stay mired in dead-end relationships for weeks, months, even years longer than we should....

I can't quite seem to say "Game Over" despite knowing that im walking on a dead-end street.