What happened to Nora Walker's British boyfriend on Brothers and Sisters?

In the TV series "Brothers & Sisters," Nora Walker's British boyfriend, Nick, is introduced in Season 4. However, their relationship faces challenges, particularly due to Nora's complicated family dynamics and her loyalty to her children. Ultimately, Nick decides to leave, realizing that he cannot fully be a part of Nora's life and the complexities of her family, leading to their separation.