I can't agree with the above point too much. Obviously I don't know how you feel about the possibility of your parents splitting up, but I can provide a little story of how you can cope with it pretty well.
When I was 13, my mum decided her marriage to my dad wasn't working. I won't go into details of why, because that's not really relevant. My sister and I saw it (and still see it) in very different ways. She took it really hard (and turned to the local church and has subsequently become a westboro-style christian, but that's another story). But because my parents never argued in front of me or anything, I was able to approach it with a surprising degree of emotional detachment. What I saw was that my mum wasn't happy with my dad. She'd found someone else who she subsequently married, and as a result she is living a much happier life than she was before. From the off, I saw my mum as just a normal person who needed to be happy with her life, and so I saw the divorce in a good light. My mum was going to be happier, and that could only be a good thing.
I guess my point here is that because I understood that the divorce would make my mum a happier person, it would make her a better parent, so when it comes to parents separating, provided everyone approaches it as adults, aware of each other's needs, then everyone can get through it in a surprisingly happy way, that benefits everyone in the end. Separation might never be fun for anyone involved, but it can still be the best thing to do.
In summary: Happy parents are better than unhappy parents!