Why Bennifer 2.0 is the real deal: ‘J.Lo was always obsessed with Ben’

When Jennifer Lopez decided to sing the Neil Diamond classic “Sweet Caroline” at the Global Citizen concert on May 2, it served double duty.

Not only was the tune — the unofficial anthem of the Boston Red Sox — a diss at her recent ex, former Yankees slugger Alex Rodriguez. It was also a flirty wink at her long-ago ex, Ben Affleck, who appeared just after her at  the event. “It was absolutely for Ben! And it also worked to piss off A-Rod,” an Affleck source told The Post.When Affleck and Lopez — dubbed “Bennifer” at the height of their first relationship, which lasted from 2002 to 2004 — were spotted vacationing together in Montana days later, close pals were shocked by what looks like a rekindling.