Publicly, Huma Abedin said she loves and forgives her husband, Anthony Weiner, despite a second round of sexting revelations. But a source close to the couple tells PEOPLE she thought of leaving him last fall when Abedin, 36, learned that Weiner, 48, was once again sending sexually explicit messages and photos of himself to other women. "He came clean to her," says the source, who is a family member. When he did, Abedin was distraught. "She was seriously considering what to do, thinking: 'Maybe, I can't do this.' There was a possibility of leaving on the table," the source says....