What is it that makes taken men more desirable?

Background: My [38M] long term marriage ended 3.5 years ago. It takes a lot of work but I spent time on my health and fitness and learning how to date again in my mid and late 30's. My post-marriage life is a bit chaotic and restrictive so I shift focus from traditional monogamous relationships to casual, short term, and non-monogamy as it was more conducive to my living situation and schedule. I spent nearly all of 2023 and 2024 having hookups while in an open relationship.

During this time my fitness is ever increasing, my confidence is high, I'm doing well on the apps. But I still never had women just approach me or show interest or have any IRL connections or meet cutes or anything. And I had a regular partner so it's not like I was on some kind of constant prowl or anything. I've been working on social skills as well and building platonic friendships too.

But I reach a point where non-monogamy is taking a toll. I'm tired of constant sti screening and condom use to stay safe. I develop feels for someone out of reach. So late 2024 I end my fwb partnerships, cut off all the apps, and take a break.

Then there's a coworker I've crushed on for a long time. We start talking and connecting and the timing seems ideal to maybe pursue something even though work is a place I've actively avoided for relationships in the past. She's very traditional and monogamous. So we're constantly talking and it's starting to develop into something. Past 2 weeks things got intimate and romantic quickly.

The exact minute I start feeling smitten and ready to do the monogamy thing again, women start appearing everywhere. For the first time in my entire life I get hit on by a stranger in the grocery store by someone I'd 100% would have been in to. A separate coworker asks me out, out of freaking nowhere. Past/recent fwb and hookups are hitting me up, and not just for booty calls. Before I was taken this kind of stuff never happened. I've heard of this kind of thing before, and I'm so surprised it's happening to me. Anyone know why this is? Do I emit some kind of hidden pheromone when I'm focused on one person? Has anyone else experienced this?