It’ll be necessary when it happens. A lot depends, I think, on your nature.
For me, I can “put up with” a lot. I don’t expect much out of people so I’m rarely disappointed, as the saying goes. But I expect some things.
I can handle not getting those expectations, even when it feels I’m being emotionally beat up for it, up to a point.
But when “that line” is crossed, and it’s rare for me, it’s crossed and that’s that.
My view of them is changed completely. All hope is gone. There’s no disappointment left.
It’s just an “I’m not you and you’re not me”. I’m civil and may seem the same but my heart feels nothing. No anger. No resentment. No sadness. No bitterness. It’s teflon to any emotions regarding that person. I couldn’t generate any if I tried. There’s simply nothing there now.