Ben & J. Lo UNDER PRESSURE
The scene looked tense. On Sept. 29 in LA, Ben Affleck and Jennifer Lopez were photographed in his car having what appeared to be a heated conversation. The Gone Girl actor, 51, did most of the talking, according to an eyewitness, as the singer, 54, listened intently. “The honeymoon phase is over,” a source close to the couple tells In Touch. “Of course, they’re still madly in love, but they’re under a lot of pressure with work obligations, being in the spotlight and blending their families.” But there’s another big issue that’s causing friction: Ben’s relationship with his ex-wife, Jennifer Garner, 51. “Ben and Jen are extremely close,” says the source, noting that the former couple share three children, Violet, 17, Seraphina, 14,…