an ending where if you're an asshole to him, he moves out of the school and comes back years later(special bad ending)
and the there's an ending where he takes you somewhere(success/good ending).
I think that's all the endings unless you're talking about the ending with no CG then just fail in his route and be neutral.
I've tried all the options when meeting him and there's only 2 endings with CG and one where you fail with no CG
Hope this helped in some way!