Just wondering about Annette...not spoiler for s2 just wondering

So, after two seasons now and all these phone calls Davey seems to have with the elusive missus, Annette...

...I'm thinking there is something truly up with Annette.

Did she long ago leave Davey? And he's covering for that, not wanting to tell anybody? Ergo, we see these frequent calls to her that he seems to have when others are around? They seem to happen in every episode. Hm.

Or is she struggling with a severe depression or a degenerative disability he does not wish to share with friends or colleagues, and he's always needing to bring groceries home (like the funny ongoing lamb cutlet plot point in s2 e9?)

Perhaps she does no longer leave the house due to problems?

Or...something else?

But all these little phone calls we've seen throughout the series surely are not included for no reason? Why do we need to see him on the mobile with her all the time? It's clearly included in the script, has to be filmed and therefore surely has some bearing on the plot for Davey?

The way Davey often mentions to others, oh, Annette expects me home, or I must pick up this or that--and the way Davey delivers the line, it's as though he's purposely saying things to people as a kind of front to pretend something about Annette.

I think we are about to discover something very revealing about Davey and Annette in the series finale tomorrow.

Thoughts?