By Andrew Holleran Many have assumed that the issue between Tom Brady and his supermodel wife, Gisele Bundchen, is football-related. After all, Brady, 45, announced his retirement earlier this year, only to come out of retirement after about a month. The legendary NFL quarterback then left training camp for more than a week, as Brady dealt with personal stuff. However, in surprising news, Brady and Bundchen’s issue is reportedly not football-related. Rather, Brady and Bundchen are going through what many couples have gone through: they’re “growing apart.” “Tom and Gisele have recently struggle…