Hi Jim. I completely agree with the rejection feeling even though I know its not true You seem to have grasped that W was going to pick someone and realistically OM was handy. I'm not sure but for me your W is searching for happiness but she has yet to find it. At the moment she's trying to be happy by using a 3rd party and that's not going to work long term.
Back to you Jim , while I envy your introspection let's not go mad. W was who she was and her being that way may have influenced who you became
Re the moving on part and why your struggling , it's called love. And you can't turn off love. I know , I've hit the switch time and time again. !!