Hi, I'm not Luna, but I have a few words for ya! Maybe they'll help...
1.) You are sooo not alone! My mum and dad divorced a very long time ago as well. But then again my dad was an awful person XD Glad they did, tbh.
2.) It's okay to be sad. Just make sure not to be sad too long. I don't exactly remember the saying, but if you stare into the abyess to long, eventually the abyess stares back at you. It could eat you up, so eventually you will have to move on.
3.) Perhaps you see your other parent every other weekend! That way you can still be close with your mum and dad.
I really hoped that helped, but it probably didn't. Sorry :( I'm sure you will come out of the darkness soon. Best of luck!