You have the right to
It’s your responsibility to
It’s your parents' responsibility to
No, you don't. You have the right to love and be loved by both parents.
If you’re feeling pressured to take sides and feel caught in the middle of your parents' problems, tell them. They might be so caught up in their own problems that they don't even know they are doing it, and once they do, they might stop.
If there are things you need to know, ask.
You have a right to ask questions about what’s going to happen and why. Although you need to respect your parents' right to privacy, they have a responsibility to answer your questions as best they can about things that directly affect you.
Parents splitting-up are very common these days. In Canada, between a quarter and a third of marriages end in divorce. That means that many people have been through it themselves, and most probably know someone who has.
Good friends will be glad you've told them. They'll know that you're still you, even though your family is changing.