Not me, but my dad had a second family. So many things! Not changing levels of toiletries/ water while you’re away. The messy house. Not caring about buying furniture/ things you need for the house etc. I think the biggest thing you don’t notice is absence... it’s kinda hard to describe. You’re absent in their mind - they don’t message you, in their presence - they’re on their phone, they are away. All those things that you put down as slight quirks, they weren’t quirks, they were absences. And it didn’t hurt until you had an explanation, and once you had it, all of those years of absence hurt at once, like a thousand rejections at once.