Louise said she didn't want to stop him from accomplishing something in his life. Saiji gave in eventually, probably realizing he's really just a no-good teenager at that point. Toward the end of the episode, he mentioned something about Louise and his getting closer to his dream or whatever I don't remember exactly.>>10621175
Yeah, he's an asshole for taking after his Dad. Tanabe will just turn out like his Mom. It's horrible, but not too horrible.