But at what point is it okay for me to just be happy. Regardless of R
In my opinion, when you're ready to treat the WS as "just another fish in the sea", then it's time to consider dating again. I think if you need to date "provisionally", then you are doing it as bandaid or to get back at the WS.
As Cadet says, there's no reason to start a new relationship until you're finished with the old one.