Onegai Teacher, Why Did It End That Way?

Hello, so I watched this anime called Onegai Teacher today, all 11 episodes of it. At the end he is unable to be with her. This confuses me, I thought I was following the plot pretty well because its predictable but good. However, like I said, the ending confuses me, I dont understand why it ended that way. I am hoping someone could explain it to me please. It would be easier if you had watched it already, but for those of you who want to watch it, whether or not you decide to help me, the

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