You sound like you are in a relatively healthy place regarding her dating. Face it, we can't stop it if they do. I don't think my W is seeing anyone, but I don't have much contact at all, and frankly I am at a place where I don't care. They will make their decisions, and they will have to learn to live with the consequences, both good and bad. Meanwhile, we live our lives and face our own truths.
You sound as if detachment is going relatively well for the moment. Good for you. It's a slow process, to be sure, but I'm finding that what people have said is true--it does get better if we practice the healthy advice of GAL, working on ourselves, letting them go as best we can.
I read a wonderful quote this morning:
"Everything that happens offers an opportunity for awakening."
Don't know who said it, but it struck me as profoundly true. We choose our reactions to life's situations. We can focus on the pain, the hurt, the jealousy, or whatever negative emotion to the point of remaining stuck. If we feel those, we must acknowledge them, but I feel it's critical not to stay there. We must make the effort to awaken to ourselves, to life, and to who our WAW have become. We want to cling to the old paradigm, or some fantasy paradigm of what we hope the future could be, but either of those simply takes away from the situation right now.