Don't try to get inside of his head. Don't over analyze his actions. Things were better this weekend, right? So obviously you are doing something right. Why is he being nice? Does it matter? Better to live in close quarters with a pleasant person than a bitter & hostile one. I'm sure he is feeling more relaxed too and that is a better environment for good things to happen. Enjoy the change and keep doing what you are doing in order to help it carry forward.
Even if you knew what was going on inside of his head you couldn't do anything about it, right? Sometimes ignorance is bliss. If you knew what was on his mind it would alter your actions, perhaps making you more tense and your life otherwise less enjoyable (I know that is a relative term!). So... keep doing what you are doing and enjoy the calm. You only have control over 1/2 the situation, make the most of it.
