My parents divorced about 5 and a half years ago. My dad was seeing someone else, and he went to live with her. My sister and I saw it coming, but we heard our mum out until she bursted into tears and told us.
Anyway, we couldn't afford the house there either, but after living in a couple of houses my mum finally could afford one, where I live now.
It's nice to have a family where your mum and dad live together, but I don't think I'd be the person I am now if my parents would still be together.
I promise you, you'll get used to it, it has it's benefits too. I wish you good luck, because I know what it's like....