Why is it that when it rains, it pours?

Well, this last Nov., My grandfather passed away. It was hard on me, but in Jan. my mother passed away. I was depressed, but in May, my ex-husband, well, I left him, cause he treated me badly. So I was away from my family, and basically had nowhere to go. I was hurting. But at times I get so depressed, all I do is cry. I have had so much happen to me in such a little, I don’t know if I can handle more. I was taught that I am here for a reason, but I don’t know that reason is. But why is it that when it rains, it pours?