All my friends abandoned me what should I do?

My problem is with my close friends. I had very close friends, and we used to sleep, stay up late, and travel with each other, and our friendship began since we were 15 years old, and they are my childhood friends , I have been communicating with them and contacting them and they admit their shortcomings towards me, and that they do not communicate in the required manner, and every time I try to remind them to communicate, I find the same excuses and nothing new to mention, what hurts me is that I was them a yes friend, if they needed money I gave them I would listen to their complaints, and would travel with them if they did not find someone to travel with them, for I am loyal to the extremes of their opposition. At the moment I am alone, and I do not find any contact or communication from them, I do not know why they left me, so have the meanings of friendship died for people?
All my friends abandoned me what should I do?
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