As these powers began to affect and injure Spider-Man whenever she was around him, they were forced to break up, which is exactly what the Kingpin wanted. In fact, this bad luck began to surround Spider-Man permanently, forcing him to visit Doctor Strange to rid himself of it. Strange's magic had the side effect of morphing Felicia's powers into more cat-like abilities, including claws, speed and stealth.
A run-in with master spy the Foreigner followed. Though Felicia was severely outclassed, he did not kill her, but in fact offered Felicia a deal to kill Spider-Man. She agreed, planning to betray him later. She resumed her romance with Spider-Man, even moving in with Peter despite her ongoing affair with the Foreigner. Ultimately, though, her double-cross was revealed, and Felicia was forced to flee the country.
Returning to New York, Felicia was horrified to learn that Peter had married Mary Jane Watson in her absence. She began dating Peter's friend Flash Thompson to get back at Peter, but her revenge plan was subverted when her relationship with Flash blossomed into something genuine. She managed a friendship with Peter and even with Mary Jane, assisting Spider-Man against Carnage's war against the city. Unfortunately, Flash broke up with Felicia, revealing that he knew about her dual identity all along and believing it would eventually come between them.
During the Civil War that brutally divided Super Heroes, Felicia opted to register via the Superhuman Registration Act. Felicia then joined the re-formed Heroes for Hire, alongside Colleen Wing and Misty Knight, to apprehend unregistered heroes and villains.
After the Civil War ended, Black Cat joined up with the Fearless Defenders for a time, assisting her friend Misty once again. They battled the Doom Maidens alongside Valkyrie, Storm, Hellcat, Tigra and others.
Eventually, Felicia grew bored of the chase and began to save up for retirement. After running into Spider-Man, who was at this point Otto Octavius in Peter Parker's body, and getting punched in the mouth for her trouble, Felicia was motivated to become a crime boss, on the heels of Spider-Man's perceived betrayal.