What do old lovers feel when they meet after years? Ask poetry, fiction and films to find poignantly romantic answers dipped in old aspic. But they do it diffferently in Hollywood, where everything is sprinkled with scenes from other lives. When Jennifer Aniston met former husband Brad Pitt backstage at the Screen Actors Guild Awards, bonhomie flowed in copious quantities (did they have a choice?). Jen (currently single, via Justin Theroux) won for The Morning Show; Brad (ditto, via Angelina Jolie) won for Once Upon A Time in Hollywood. They applauded each other, but the paps captured him clinging on to her as she pulled away. Are men affected more?