Ben Affleck has a new possible bachelor pad! The Argo actor, 51, has reportedly closed on a $20.5 million mansion in Pacific Palisades, Calif., as his marriage to Jennifer Lopez continues to crumble. The lavish estate boasts five bedrooms, six bathrooms with breakfast and dining areas, as well as a separate family room. The home also has walk-in closets, a media room and a guest house. As OK! previously reported, the Selena actress, 55, celebrated her birthday without her husband, whom she married in 2022, in New York while he stayed on the opposite end of the country. “It has been a hard year…