If that is truly the case, their love story being that they had eyes for each other, why did he kiss his intern in D.C? That was history repeating itself, if you ask me.

Also look at your last sentence. Addison and Derek both chose their careers before each other. That is exactly what happened in the season 10 finale. Derek chose D.C. and Mer chose staying in Seattle. We saw what happened with Derek when he stayed in Seattle. He was grumpy and resentful for still being there and that’s when Mer told him to move to Seattle.

Honestly, Derek didn’t look at Addie like the way he looked at Mer because Addie was his equal and to some men, that’s unattractive. Mer was younger and very much more naive at that time he met her.