I now know that things I always thought I could depend on can crash in an instant. Because of the love that I have been shown, I now know what it means to be 'beloved.' I now know that no breath is to be taken for granted.

This quote is saying that before, the speaker thought that certain things in life were completely dependable and reliable. But now they know that anything can change in a moment. Because of the love and support they have received, it has given them a better understanding of what it means to feel truly loved and appreciated. They now understand that you can never take anything in life for granted and that nothing is a guarantee.