Vanessa Lachey thinks good communication is key to a happy marriage. The 41-year-old actress married Nick Lachey in 2011, and she thinks being open and honest with each other has been the backbone of their relationship. She shared: “You need to communicate. You need to be responsible for your actions, you can’t just point a finger. “But also, I think, on the flip side, you need to applaud that person when they do something beautiful and right.” The loved-up couple regularly attend therapy sessions, as a couple and as individuals. And Vanessa has recalled one particular piece of advice that she…