In my opinion, youre souring on this because you are finding yourself in the friend zone with WW. She isnt being proactive about doing any work towards ACTUALLY making your relationship healthy, and so youre doing this kind of causal meeting periodically. I have no idea if you set a hard boundary about this what her response would be. But in my opinion, youre getting impatient, because you want to see something more from her, and she isnt doing it. She says you should "see someone" but hasnt made any effort towards scheduling something or even researching what might be out there. How can you expect yourself to be '100% in' when you are sensing that shes only, say, '50% in'?
I think it is perfectly reasonable to say that youd love spending more time with her, but at this point, you arent willing to settle for just being dinner buddies. If she wants to go to counseling together to figure out how to rebuild the relationship, then you are willing to try that. If not, then maybe it's time to part ways.
I dont know. Ive never been at the stage you are in. That said, I really have no interest in being at that will they/wont they stage. If my ex were to come back at a time when I was single, I wouldnt be interested in just being a friend - I know it would be too difficult for me.