Britney Spears is back on the market! The pop star, 42, went on a scathing rant against her ex Paul Richard Soliz via Instagram on Sunday, July 7. “Why was he going 90 in a neighborhood with one pap following only to roll the window down when the pap pulls to the side of me ????” the “Toxic” songstress posted on the social media platform as she questioned her ex’s behavior in a paparazzi photo taken after she settled her conservatorship case in April. “Then he calls his mom and says he’s being harassed,” she continued. “Why did he roll the window down with me crying in the seat??” She then pos…