8 Addison Montgomery On Derek Shepherd Addison was said to have cheated on Derek with his best friend Mark Sloan prior to the timeline of the show itself. She then came to Seattle to put things right with Derek. However, their marriage was soon cut short when Derek cheated on her with Meredith.

Which episode does Derek cheat on Meredith?

Episode 15: I Feel the Earth Move Watch this scene from Greys Anatomy Season 11, Episode 15: I Feel the Earth Move.

Who answered Dereks phone in season 11?

“And shes your research fellow. Just your research fellow,” she confirms. According to reports, actress Scottie Thompson will portray Dereks D.C.-based fellow, Renee Collier – the character who answered the phone when Meredith called. “I wish I could believe you,” Meredith adds.

Does Derek admit to cheating?

Derek then pleaded for his wifes forgiveness. “I thought D.C. was everything and I was wrong,” he admitted.