I have to agree with Taylor. Humanity will always be humanity. People will always prioritize their struggle or their problems over that of others. It is often how we survive. Unfortunately, most often by the time we admit to needing help those who we could ask are otherwise occupied. I cannot count the friends I have had to turn down when they ask for help simply because I was unable to be there. It does not mean that I did not care it meant I couldn't be there.
That said, what is the core motive behind how you feel? Are you disappointed that they were not there when you needed them or was it that they were not there when someone else did. Is it that they did not drop everything to come running as they had before; or as you had before? Remember that even an ambulance arriving on a call is dependent on its availability.