Longtime Bachelor Hugh Grant Believes Affairs Keep 'Marriages Together' — WHAT??

Hugh Grant is an expert about marriage -- despite never marrying!
On Wednesday, the Love Actually star stopped by Howard Stern's Sirius XM radio show and celebrated people (like his Florence Foster Jenkins character) who are extremely dedicated to their marriage but still have a side piece. HUH?
Video: Hugh Gets Candid About His 2007 Breakdown!The 55-year-old explained:
"I always admire the French and the Italians who are very devoted to their marriages. They take them extremely seriously, but i