Brad Pitt is eager to put his past with Angelina Jolie in the rearview mirror. Jolie first filed for divorce from the Bullet Train actor in 2016, except their legal battle seems to be never-ending — and Pitt has grown sick of it. “The long-drawn drama with Angelina used to really get to him, especially the custody drama and abuse allegations,” a source recently spilled to a news publication of Pitt — who shares Maddox, 22, Pax, 20, Zahara, 19, Shiloh, 17, and twins Knox and Vivienne, 15, with his Mr. and Mrs. Smith costar. The insider continued: “It’s been very stressful for him to have to def…