In their situation, Derek was Richard, Meredith was Ellis, Addison was Adele, and Finn was Thatcher. Derek stayed with Addison for a while because he thought it was the right decision for him just like Richard stayed with Adele because he felt he owed it to her. Unlike Richard who left Ellis and never regretted his decision, Derek regretted choosing Addison over Meredith and divorced Addison to be with Meredith.
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