So irritated or maybe it’s just me

Sooo me and my bf only been together for 6 months. Not long at all. BUT he use to act so different on the beginning about things More sweeter and just was always about me. But now it’s like more different because he doesn’t do the things he use to. I mean he’s not mean or anything but hes just different. And I tried to explain to him but he said I can’t “force” him to do anything and that I need to stop trying to change people. Which I just asked him to treat me like he use to which was wrong on my part I guess. But things have been different which hes a truck driver so he’s always working but he never actually understands me but he does listens. I just don’t know what to do?