Mario Cabre, 75, a bullfighter and actor who in 1950 was romantically linked to the late actress Ava Gardner. Cabre became widely known outside Spain for his romance with Miss Gardner during the filming of “Pandora and the Flying Dutchman,” which they made together with James Mason in the Spanish Costa Brava. During that same period Cabre and Frank Sinatra were vying for Miss Gardner’s affections. After retiring from the bullring in 1960 after a 17-year career, Cabre played leading roles in a number of Spanish films and plays. In Barcelona on Sunday of a lingering heart ailment.