DP and I have been exclusive for last 6 months, known him around 8 months. He works in surgery and has always been very busy, though we’ve seen each other weekly, 2 or 3 nights a week. He comes to me and vice versa. In most ways he’s a perfect gentleman. He is caring and loving and we get on very well.
He’s due to write a paper by end of September. He now wants his weekends exclusively dedicated to that as he feels the deadline is now getting too close if he doesn’t start soon. I get it. He can’t really do it in the week as he’s on shifts. I get that too.
But what I don’t get is literally writing off a full weekend of seeing each other?! He initially said we could get dinner sat eve but then first thing Sunday he’d be back to the paper. I said that was fine but would be nice to stay Sunday eve and said I’d meet friends on Sunday then come back Sunday eve for dinner and stay over before work on Monday. He didn’t like this idea, said he needed the entire weekend on the paper and even dinner sat night was pushing it. I’ve asked how many weeks he foresees this and he says he doesn’t know as it depends how it goes 
We’ve since arranged that we will meet Sunday eve and have sun and mon night together which is fine though obviously work in between and he will probably work some of both evenings. I can put up with this and accept it - I also have a very heavy job and work most days.
My question is, do you think it’s strange or unreasonable for him to take this approach? To write off whole weekends essentially? There’s no way he’s seeing anyone else. I’ve no reason to doubt him but it seems so excessive not to at least have a quick dinner (I even said I would cook alone so he could carry on working and just have quick chat when eating). He’s known for being quite obsessional with things, compartmentalises a lot. I just feel a bit shit about it. Unfair of me? Would you be ok with it?