This. Even if your heart isn't in it, get out there and "don't waste the pretty".
Meet new men, meet new people, have a 1-2 year socialising strategy. Do something new every few months (intense hobby or social event or travel plan) rather than wasting time in this odd situation.
Often it's emotionally safer to be thinking about someone like this guy than go through the anxiety of dating and meeting new people.
This situation is a crazy intense dynamic for something with very little gain.
I dislike being the "work wife" or "confidante" of married men.
It's VERY common for married men to like developing these fairly ambiguous "friendship" situations. Especially with attractive, easy going single, junior females.
I've had situations where married men refuse to answer work email in a timely fashion, to entice me to phone message them.
They're not in love with me and have nothing to offer my life, they're just bored and want to suck attention from me.
Why aren't they making friends with the dads of their kids friends, rather than targeting a single woman?
It's all them getting an ego boost or trauma dumping.
It's less "easy" initially but I prefer my WhatsApp to have single men making solid date plans than Married Dave sending endless chat messages.
They are getting attention and taking your headspace and emotional resources whilst having the comfort of a family life.
For workplace, you need allies and people who give you references or practical help.