You can get lucky. Cathy and I have absolutely nothing in common since the heat went out of our life but we learned to love each other before that happened. Since then, we were kinda co-dependant on each other till she fell ill and now she is just dependent on me, which I will live up to as long as she is still with me. You can get lucky and you can be unlucky. It can depend a lot on weather or not one or both parties are willing to sacrifice themselves for the other.