So, this is weird. I heard yesterday that my father and stepmother are separating. He's moving out, leaving her with two children (my half siblings). His side (through my sister) is that they have "grown apart" and "the pressures of life" have led to this. DSis1 is baffled, as am I - I know you don't know what the state of someone's relationship is behind closed doors, but they always seemed very solid. They've just finished doing up a derelict farmhouse 
So I phoned up last night. I live in a different country. He was out, so I ended up chatting to my stepmum for ages, mostly just catching up, but we did talk a fair bit about the separation. Her story is MUCH different - apparently, he's saying that he doesn't do anything for himself, he doesn't have any hobbies, doesn't feel free, he doesn't really like living in the country after all, it's all been her dream, not his. She's really baffled and although she comes across as stoic, of course pretty hurt by this. She isn't a controlling person, she's always encouraged him to go and do his own thing, they went off travelling before they had DC, she said she was aware that the house in the country thing was more her dream than his, but she'd always double checked he was genuinely as enthused about it as she was, and he said he was.
She described that he is drinking a lot recently, that he is very bitter (this fits exactly with my impression of him, I have to admit that we're not hugely close and I don't feel like I know him very well) and that he never goes out and does anything. He did recently (in the last year) lose a parent, and I know that grief can cause people to act in unpredictable or strange ways, but this just seems really bizarre - everything he is saying, he could do IN his marriage. I know that sometimes people just need to make a clean break, and I'd never be one for pushing someone to stay in a relationship which makes them unhappy, but it seems as though the unhappiness is coming from him, not the relationship.
I tried to talk to him tonight, but he had my DSis2 with him, so I couldn't really talk freely (she is a child), and he kept it fairly neutral. I would like to hear his side, so I will wait until he's actually moved out, which is planned for next week, and speak to him then, but for now I'm just experiencing such a mix of emotions about it.
Not really sure why I'm posting except that this board feels like "home" as much as any place on MN and it would be nice to have a supportive ear or any kind of insight into WTF might be going on. I have an idea, especially as I suspect he's rather like me, but I'm trying really really hard not to jump to any conclusions especially before I speak to him myself.