It wasn't even a phrase until a couple of years ago Oh, I think those of us who have cut off our APs for 20+ years were saying that way back when.
I was low contact for decades. Then, when mys DSis finally saw sense (after being ripped off for tens of thousands of pounds) I went totally no contact. And has been so for about 5 years, using that term to describe her current relationship with them.
It is REALLY hard to tell whether someone is being in any way unreasonable as the given reason is almost always just the last in a long chain of things that cause the break of communication. I had to stay in communication for DSis. She was being abused by them but couldn't see it.
DF is an absolutely convincing manipulator - which is why DSis and I are currently ostracised from the wider family as 'poor old DF' is desperate to know how to make everything right between us, has no idea what went wrong with us! Lies, manipulation, theft! You can't forgive those. Especially as the eleventy trillion times you did succumb to an "I'm so sorry, we miss you, we love you" email you were soon hit with another begging letter, heart strings tugged and some weird scenario played out that was unthinkable that it was just him, playing a con again. Unthinkable that he'd use the death of a brother, the car crash that wrecked a family member's life, as an excuse to take more money off you. But it always was a con, he always took the money and looked at you, said you were mad if you questioned what had actually happened - he never asked, you never gave, it never happened!
But hey! He's a lovely man, would give you the shirt off his back - mainly because for many years it was actually the shirt paid for by DSis and he could always get another one off her!
So please, don't judge. Just accept that some of us go through hell making that decision. Some of us bear the guilt of it every day. But we can't go back, in my case not for love nor money, quite literally!