The problem is that I have started to resent him because he hardly seems to care about cleaning up after himself.
He isn't an absolute slob, but he will just leave a box of his stuff in the middle of the floor in our room for weeks, and will play video games instead of doing any chores everyday.
Whenever I try to bring this up to him, and try to implement a cleaning strategy, he instantly gets bothered.
He's a great guy, and super sweet. Other than this issue we get along great.
Anyone else in this situation? What should I do about it?
EDIT: I am only interested in ways I can make improvements, not break up with him.