The 16-year-old girl stabbed to death in Long Branch in September was killed by her 20-year-old ex-boyfriend after she broke up with him and he repeatedly texted her seeking to meet, authorities said. The motive in the killing and the relationship between Bryan Cordero-Castro and Madison Wells was revealed by the Monmouth County Prosecutor’s Office this week as Cordero-Castro was indicted on murder, stalking and weapons offenses. Authorities had previously said only Cordero-Castro and Wells knew each other, but didn’t specify the nature of their relationship. -------------------------------- Cordero-Castro, a Guatemalan citizen, is in the United States illegally, the prosecutor’s office...