As Kristen Stewart and Dylan Meyer’s relationship crosses the one-year mark, things between them are stronger than ever. It’s a decidedly new chapter for Stewart, who opened up in a recent issue of InStyle about being “sort of cagey” in previous relationships. Meyer and Stewart were first romantically linked last summer, but the couple actually met six years before on a movie set, Stewart told Howard Stern last November. They later reconnected at a birthday party for a mutual friend. …