FunBun, sorry to hear you're going through this during what should be a happy time. I'm newer to the site as well and you are in a good spot to receive some wise advice from veteran DBers.
Sounds smart that you are working on GAL and detaching. I did want to share, when I got married 5 years ago, I went through a brief time where a part of me felt down about the change. I remember leaving the house and crying as if I was mourning my old life. I loved my H and was happy to be married, but a part of me was sad. I researched it at the time and found it to be a common period of transition where a person can go through depression.
My H also started with a period of depression and anxiety which lead to the BD over the summer. I keep reminding myself that my motivation for giving him space and GAL is to give him the chance to see I'm not/our marriage isn't what's causing his depression.
