I was going to write a longwinded thing but basically that. My mum and dad split up when I was about 18 and my sister was 16. I'm 44 now and my dad's been married to my stepmum for about 11 years, since my early/mid 30s. We had no problems with the idea of having a stepmum and she was nice as pie before they married.
I was staying there a while back for a couple of nights and she drunkenly stormed up to the room I was staying in and went on about how our dad used to spend Xmas alone (he spent it with his side of the family, whereas our mum genuinely didn't really have anyone to spend it with reliably except us, which it why we spend it with her- he was already spending it with other people.) He chose to move 150 miles away from us to live near his sister, or maybe we could've seen them both on the day sometimes. It's only recently I realized that his choice to move down there effected the things he supposedly moans about such as us not seeeing him much etc.
She also said that I never tell him about my life. I just wouldn't tell my dad stuff in case it made him worry (they claim he worries anyway but for all I know he could worry more if he knew what was going on; not that there's usually much drama in my life anyway) and we were never a communicative family. He's quite a reserved person. If there is anything going on in my life I might talk to my mum about it nowadays, but it would just be stuff like my relationships, which I think a lot of women wouldn't tend to talk to their dad about in any detail.
Anyway, 18 months on and I finally replied to her in more detail with these details above. We were never a family that argued and so I've never been good at handling confrontation or anything in the immediate moment; it's like I'm struck dumb- I can know exactly what I want to/should say but don't.
I'm talking to her about it now as I'm maybe a bit closer to her as we share similar opinions about current affairs etc.
But I think she's trying to deny what she did entirely, IDK.
Just letting off steam really.