Most Helpful Girl
It's important that you have someone that you can talk to about what you're going through.
This can be a counselor, counselling can often be found through your school, a close friend or family member, a sibling, a support group for kids whose parents are already separated and are/or about to divorce.
Or you could try reading a book about divorce, or about a kid who's parents get divorced.
Wishing you the best of luck.
Most Helpful Guy
Don't take sides. No one is really at fault, unless it's something like violence or cheating. Just be there for each of them and they'll be there for you. They will always be your parents, and hopefully, will never turn their backs on you.