Does it end...really?

I've been thinking. I just wanna know why does stuff have to end. If you think about it, everything ends, nothing lasts forever. Why? One example is when people get married. I'm not saying that this happens to everybody cuz I know it doesn't. First it starts off all happy and lovey dovey, all caked up and whatnot and then stuff slowly starts to crumble. Why does stuff change? Why does it have to be that way? What happens to people? Marriage is supposed to be a lifetime commitment, not a few years, few months or even a few days. Yeah I said it, a few days. { I know right? } And I know it hurts them so bad when they try so hard to make it work and it just doesn't. Or for instance, my cousin is a lawyer in Chicago. She's been working at a top notch law firm for about a good 9-10 years. She is one of the best female lawyers in her city and she has been trying to make partner for quite sometime now. No matter how hard she tries, she prays she does everything she possibly can. She's been working her { excuse my language } ASS OFF and it's men who have less seniority than her and they making partner already. Why? Sometimes I wonder why when you want something so bad and you do so well you don't succeed. That ish hurts man...fa real. Just some stuff that's been on my mind. >>>>>Think about it.