So sorry you find yourself here, but you will got great support and advice. In fact, you are already getting both from ReadytoChange.
I am writing to echo something that R2C has already said and to answer a question you posed. You asked how your WAS will notice the changes, the 180's, and the GAL since you have no children and he is no longer around you. I asked this very question and got great support.
Practically speaking, he will notice. There are lots of ways the WAS and the LBS end up interacting (my SBXH and I have no children and still ended up in contact very often - after a lengthy silence form him). Mine snuck home in the middle of a workday, packed, left and would not tell me where he lived for months. Ultimately, we got back into contact and he eventually told me he noticed lots of changes in me. Said he was skeptical at first but ultimately accepted them as genuine.
I think the more important answer to your question runs a bit deeper than the practical. It was very hard for me in those early days to accept the notion that I had to learn to focus on myself, detach from my spouse and really, truly let him go. (By letting go, I do not mean you have to believe you will not reconcile; rather, I mean you must accept that being apart in this moment is his choice and you have to learn to let him have the freedom to make that choice). If you find and read some of my early posts, you'll see that I was a mess and the poster-child for a raging inability to detach. Then, slowly, in my own time and at my own pace, I detached. All the while, very slowly learning to focus on myself. By doing this, I came to realize that it was I who did not want to reconcile. I am not saying this will be the case for you. I am only saying that you will find clarity and your own truth and answers once you can get your focus more on yourself.
I know what I am suggesting seems a Herculean task, at least it did to me when it was suggested to me. There is so much pain in all of this. There were so many days I just wanted to wake up and find it was all a bad dream. Be patient with yourself.
Also, as for detaching - I wish it were not a verb because I do not think it should be looked at as an action one can take. It is more like an end that results from lots and lots of GAL and keeping your focus inward.
One last bit of advice that I received from another poster here, Healthydad, which is this: be kind to yourself. He posted that to me a lot in the early days as he, with others, encouraged me as I learned to detach.
Know that you will be okay and if you do not know this yet, tell yourself that you will, everyday, until you start to believe it.
