In my experience, married men almost always tell (or imply) a bunch of shit to the other woman to "invalidate" their married status.
"I'm married yes .. but not really, and here are the reasons".
They're always only staying for abc, the kids area big excuse. Often they;ll make out that they're staying in this invalid marriage because they're such a good guy they don't want to upset and disrupt their kids. The fact that they're betraying their mum and if the infidelity is discovered will at best destabilise their mum for years and at worse destory their family is rather obscure for them.
They're such a good guy.
Sometimes they'll claim the wife is not interested in them, that she's going through the motions too, that she might not even care or be upset if they have someone else etc.
There's a script and it's older than the pyramids.
Young women often fall for it because they don't have the experience not to. Also vulnerable women (naive, low self esteem, vain, damaged, unhappily single, not log out of a marriage/ltr .. often a bad one etc etc.).
Some people love the predatory woman idea but the reality on the vast majority of the cases Im aware of is actually more of a predatory man, v fast to make & exploit an opportunity for a bit on the side.
And as someone who's had overtures made .... men are usually either switched on and open to infidelity or not. Those who aren't you wouldn't even have the slightest opportunity to act inappropriately with the, and you'd be aware of the possibility of utterly humiliating yourself if you tried.