He seems to actually like and truly care for the kid, and he knew that he wasn't completely ready for the "full course meal" so he's probably waiting for him to be fully ready and willing.
From what I heard the publishers/editors or something wanted her to focus more on her more popular series at the time she was making this one. I don't think it's completely dropped? She did finish Michiru Heya after a long hiatus on it so...
yes i want to know what next about this manga
This was going so good. I doubt there will ever be any additions to the story D: I wonder what happened that sensei didn't go farther?