I’m on the fence about Olivia and Fitz being together, but I don’t care for either of the people they are with presently. Does Fitz need to take care of Mellie? Yes. Does Olivia need to wait for him? No. Does Olivia need to take care of herself? Yes. Does she need Jake to do it? No.
Does Fitz need to stay married to Mellie to take care of her? No. knowing that his father did something horrifying to her doesn’t mean he can fix her. Even with the truth in front of them that doesn’t mean Mellie can take care of Fitz. In fact given both of their emotional states right now I expect they’d do each other more harm than good. But each and every last single one of these characters is weak when it comes down to it. They are too weak to take care of anyone else, much less themselves.
I don’t think we’re meant to see Olivia’s departure with Jake as a positive. I think that is why they had Jake attack Olivia in the previous episode. All his other behavior could have been attributed to him doing his job. But we he attacked Olivia last weak, he did it because he was angry and he wanted to control her. I think we are meant to see Olivia choosing to leave with Jake as a sign of weakness, neediness and co-dependency.
If little Jerry hadn’t been shot Fitz might have been able to get his shit together. Go to some therapy with Mellie, get to the point where they might have a harmonious divorce, but Fitz is in no state to help anyone, make good decisions or even be president.