Why does everything seem like it falling apart ?

Because everything IS falling apart! Life is this whole weird entropic cycle where things are born, get bigger, and then fall apart - there's a period of time where it SEEMS like things are getting better, but it's all really just part of this long and kind of awesome and terrible journey back to nothingness.

The upside is that the one thing you have control over is your perspective on everything. You do your very best to enjoy everything while it's still in your life, and you can do your very best to be a positive and joyful part of other people's lives!