Have you ever gone through something in life that makes you feel like your friends have actually abandoned you ?

I feel like I am going through something right now. And more than anything I feel like everyone who claimed that they would always be there for me … just aren’t. I don’t expect them to live through every moment of this with me because you can’t ask that of your friends. The funny thing is though … is that when they’re going through something they expect me to be there and I haven’t let them down, the only time I couldn’t physically be there was when I had to go away for school. But otherwise, I’m always available to them. Never asking, never arguing… just unconditionally being there because I get what it is to be a FRIEND. I just feel like my friends aren’t my friends anymore. What am I supposed to do ?