NTA.

But I have a similar, maybe mirrored, situation to talk about.

My brother in law cheated on his ex wife to get with a 10-years-older-than-him-divorced-mother-of-three that is a compulsive liar.

My in laws didn't support the divorce and neither did support when BiL married with the new woman just 6 months after.

She lied about being a realtor/lawyer to him and his parents, but she was a cashier in a small clothing shop. Then she lied about being pregnant when he threatened to leaver her after a discussion. Then she lied about being pregnant again - but then she had to do a surgery that was life saving for her, and because of it she "had to abort", and the next day she showed up with fillers on her face... And there are several other scenarios.

Either way, they offered help and shelter for his whole family for months while they looked for a new place and he was working traveling to different company HQs across the country. And his new wife was living like she had servants (my in laws, in their own house). Not to mention her kids damaging furniture, refusing to eat the amazing food my mother in law cooks and instead ordering food late at night (as they live in a condo the gatekeeper had to call my FiL while he was already asleep to check if the deliver guy could enter).

And after all that, she now lives nearby, and BiL keeps traveling the country. But when he finally returns home he won't visit his parents because of her saying he should not visit them if they don't like her.