How to live with a boyfriend?

Noelle
My boyfriend of 4 years and I are considering moving in together. I think that we would love it, but I know that relationships change when you live together. I also know that it's really up to us and that everyone is different, but any advice on making sure the relationship stays healthy and happy? I don't want to get stuck in a rut and hear about people breaking up soon after they move in together. Thoughts? Experiences?