I know how you feel. My mom has already went through one divorce and might be going through another one soon.
For a while things will be wierd. You will feel like there is something missing.
This will pass.
You may also feel angry with your parents. Get over it. This is probably better for both of them.
You might feel like it's your fault. It's not ever your fault. Your parents are the ones with problems.
Everything will turn out good. Just look at it my way.
You will get twice as many presents for christmas and your birthday.
You might end up with a really cool Stepbrother or stepsister.
However if you end up with a really cruel one, you don't have to pay any attention to them because they weren't yours to begin with.
When your parents split up if they decide to move to different towns you'll have twice as many friends and will not be as bored as most people.
My best words of advice are do not try to get your parents back together. If they have any chance of getting back together they will, if not the harder you try the worse things get.