spicey1: A friend of mine is going through something right now, and not really sure what to tell her. She recently started dating this guy and it seems things were going well.
Well last night she gets an email from her, that she had a feeling was coming. His best friend (a woman) is sick with cancer and may not be much longer, its in advance stages and there is no way to treat it. He says he is in love with her and wants to spend as much time as possible with her before she goes. He says that he wants to pursue a relationship with her maybe once the other dies. Of course she feels for him and understands, but should she wait? What if the other woman survives the cancer? Any thoughts?

setting ALL feelings aside, one should hope that the woman in question would survive the cancer...right?
What is there to think about? He has made his choice. No one really knows when or where or how they will die. Life is but a fleeting moment in each of our lives, although sometimes it may not seem like it.
Why would she wait? What would she be waiting for? A woman to die and a man to get over the grieving? Doesn't make much sense if you think about it...jmo