What happens to lumen on Dexter?

In the TV series "Dexter," Lumen Pierce, portrayed by Julia Stiles, becomes a key character in the fifth season. After teaming up with Dexter to seek revenge on her captors, she develops a close bond with him. However, by the end of the season, Lumen decides to leave Dexter's life to seek a fresh start, feeling that her dark experiences and Dexter's lifestyle are too intertwined. This departure highlights Dexter's struggle to connect with others while grappling with his own dark urges.