The fashion designer said that people had been gossiping about their relationship since they became a couple.She added that their partnership had added to their success, explaining: “We both realise that we are stronger together than we are as individuals.”Would either of us be in the position that we are in now had we not met and been together all those years ago? It’s all about the family unit.”We are much stronger the six of us, than we would be if we were individuals.”We respect that family bond and that is key.” Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. Marriage to Victoria Beckham can be “complicated,” her husband David has said in an interview about their enduring relationship.The former England captain also acknowledged how their 19-year union can be “hard work.”While they have had to constantly fight reports that their marriage is on the rocks, calling the most recent rumour “laughable,” the couple have spoken of the difficulties of a long partnership.Mr Beckham was candid about his marriage, telling The Sunday Project, an Australian TV show: “To have been married for the amount of time that we have, it’s always hard work.”It becomes a little more complicated.”He also spoke about fatherhood, adding: “Sometimes it’s the little things that make the biggest difference.”I’ve noticed that with my children.”The A-list couple have four children together – sons Brooklyn, 19; Romeo, 15; Cruz, 13; and six-year-old daughter Harper. They met at a charity football match 21 years ago when he played for Manchester United and his future wife was Victoria Adams – or Posh Spice in the Spice Girls.Victoria Beckham has also recently opened up about their marriage – after unfounded social media rumours swirled about a possible split she told Vogue the pair were “pretty used to ignoring the nonsense and just carrying on as normal”.