Grace, even though I pushed OD to file for divorce in spring 2018 (that he dismissed in Jan. 2019), I still felt a little punch to the gut initially. It passed after a bit. When I got the attorney letter back in September to get things moving on the separation, I felt it again, but it passed very quickly. I check the filings from time to time to see if he's filed again and used to feel a bit of anxiety waiting for the result to come up. Now I feel nothing. Usually just disappointment that he hasn't.
Also, in my experience, him hiring an attorney doesn't mean much. OD has had three that I know of. He just can't seem to take their advice and follow through on anything. Yours probably won't be able to either unless you push him. I've resolved myself to that.