Yes, Danielle Fishel did date Matthew Lawrence. While many fans of Boy Meets World during the 1990s hoped that Fishel and her co-star Ben Savage were a real-life couple, Fishel was actually dating Lawrence behind the scenes during that period.
Their relationship was a topic of interest given their status as popular teen actors at the time. Despite the public's perception and hopes for a romance between Fishel's character, Topanga, and Savage's character, Cory, their off-screen lives involved different romantic pairings.