Kevin Smith’s marriage has lasted so long because he and his wife have “no rules”. The ‘4:30 Movie’ writer-and-director married Jennifer Schwalbach Smith in April 1999 and he doesn’t think there’s a set reason why they have stayed together for so long other than enjoying one another’s company. Kevin told People magazine: “My first instinct is, well, there’ve been no rules, and that’s probably why it’s worked so well for 25 years. “I can’t speak for her, but I just like seeing her. I just like being around her. She’s my human.” The 54-year-old director – who met Jennifer when she was a journali…