The main difference, of course, is that in the employment market people are generally taken out of the market when they get a job (although fully remote has driven a huge rise in moonlighting).

In the dating market, women are inundated with matches from hundreds of guys, so they just pick the hottest guy, have a short term fling, and the guy ditches her after a couple of dates and continues working through the rest of the women (often in parallel). So, the hottest guys are never taken off the market, meaning the middle tier guys get few chances, and women complain that "men are all the same" and only want ONS not a relationship.