Just to be very clear, I don't believe that the cliche of men doing this - finding some other woman and then leaving - is a real thing becuase of anatomy or biology. It's because of the way men and women are socialised and the endless lessons we teach girls and boys without even realising it. men centre themselves and society has allowed, or even encouraged this, for a long time. It's one of the reasons the language we use for girls vs boys or men vs women is so often different with such different connotations.
Funnily enough, I personally know two couples well enough to have seen the situation where the man has CLAIMED that the relationship broke down because of the woman's "issues". But it only takes a tiny tiny bit of digging to see that it's far more complicated than that. In one, she was completely worn down and no, she ddn't want to have sex. Why? Because HE had never stepped up. He claimed he was so stressed at work that she had to cut back to part time hours becuase the "stress" of coming home and having to do childcare or housework was too much for him. If the house wasn't spotless when he came home, he would have a meltdown. If he couldn't go running for 2 hours 6 days a week... he had a metldown. And yes, she became a nervous wreck. I remember going over one day and she was in a state because she hadn't had a chance to clean up the kitchen after the DC's dinner and he was going to be home soon. Another time, she came out for drinks and her parents were looking after the DC as he was away for work and she told me how relaxing it had been not having him there. But ify ou spek to HIM he will tell you (as he has told many mutual friends), that she became boring and anxious and he just felt like he needed more.Oh, and it was a total coincidence that he found a new partner within weeks of breaking up.
The other claims his ex was "toxic" and "mental" and that he "couldn't do anything right". Funnily enough, I've personally experienced his aggression when he didn't get his own way directed to me, my dh and my DC as well as to other people. He once physically shoved me out of the way because he was so angry that we were hosting a baby shower for his wife at their house. Since the relationship broke down, even as he tells everyone how "mental" and "toxic" and "narcissistic" she is, he has not had their DC for a single overnight, has routinely disappeared for months at a time (apparently she's caused his mental health to be very bad) and has not paid a single penny towards his children.
And on MN and hearing stries from other people that are similar, I know how commoon this is.
So I'm sure you'll hate me because frankly, i dont' believe most of the stories about needing to leave because of a woman's issues.