Yes I think my H did have bad depression, not as much as me, but still depression. He would deny it but you don't quit going to work and do the stuff he did without depression.
He seems so much better now. More like my H, but a few things have changed, some for the worse, some for the better.
For instance, now he is less romantic than he used to be in the M and he doesn't concede to my side of looking at things very much, but the positives are he does at least say 'I understand why you feel like that' instead of immediately jumping in with a defensive.
Before if we disagreed, he'd just fire all his arguments at me like it was battle ships. Now even if he doesn't always accept my point of view, I feel as if he hasn't just rubbished my feelings because he at least bothers to let me talk.
Also, our SL is miles better than in the M and I am more assertive with it.
I also feel that I have proof that he does love me because he still wants me after all that court hell and the OW. So it's swings and roundabouts, really.
From your posts I'd say your W is worried about YOU finding an OW so I wouldn't worry yet.
Don't worry about stuff that might not even happen.
Dress well and treat her like a Queen then she won't feel any need to run off with an OM.