Hanna, if I've learnt one thing in my life it is that people like this are not normal and don't think normally. Any energy you use trying to work him out is wasted, totally wasted. There is no sense because according to people like him (and his mum) the world is how THEY make it, everything revolves around them, and reality is exactly how they expect it to be - in that it works in their favour every time. If it doesn't, then it's WRONG and must be forced into obedience.
That's what he's been doing to you, for ages I expect, making you fall into line. I knew a twat who thought when he got married, he would never have to wash up again. His wife had other ideas. She was brutally coerced to fall into line, and spent the bulk of her energy ensuring that all the little inconveniences of life were removed from his path. It went on for years, and this confident, very talented, feisty woman turned into a non-person. If you said hi to her, he'd put himself between her and you so you couldn't have a conversation, so many things. EA all the way. I hope she's got away from by now, but we moved house and I haven't seen either of them for years.
Is this what he's been trying to do to you?
If so, then I can promise that you already spend too much thought on him, and too little on yourself - his fault, he's trained you to be like that. What you could do is tell yourself every time you find your thoughts straying to why he's doing it to just tell yourself "because he's a twat" and force yourself to think about what YOU need in the next 5 minutes, a cuppa, a small piece of chocolate, to read a book for a little while, a bath.......
Good luck tomorrow xx