Who goes rushing into a new R after the previous one ended 5 months ago - a R where exW had accepted a marriage proposal.
On Bustle, a dating expert’s rule of thumb is “ Theoretically, I would give two to three months for every year you all were together to process the loss of a relationship, grieve, and pick yourself back up.” However long or short it takes to process it is their real advice. I found several sites giving 3-6mo as a typical timeline for a 1-2yr relationship. So the answer to “Who would date.. after 5 months.. after 1-2yrs” is probably most people assuming they could get through a few dates without ranting about them.