In my experience if you're virtuous and saved the girl (i don't recall her name) and generally agreed with destroying the arrays then you should get the option to room up with him still. I find that he always leaves if you don't go through with the event of saving Peng Xinhong or whatever her name was however so he always leaves in evil runs.Say, quick question, does being in the LB route locks you out of being in mansion mates with Yue Fang? I agreed to destroy the array, got to the scene where he kicked elder Ping out and then came to us to ask why we haven't packed our stuff to move to the mansion yet. But it always ends with him leaving angrily because he couldn't comprehend the fact that we're working together as EQUALS rather than MC serving him.
It's possible that has changed recently though and you need to side with the Yue fully now.