Hi there. Welcome
To me personally, it seems completely normal. He could just be a dream character that symbolizes your old school. Or he could be just another recurring dream character. I myself keep dreaming of some people I'm not really close to, or people I don't really know well and wouldn't take a second look at irl. But they manage to find their way in my dreams nevertheless. I think that the part where you dream about having or creating a relationship with him could be a manifestation of something in real life where you are trying to create a connection with someone, and not necessarily that guy in the dream.
That's my two cents. I hope that gives you a bit of insight
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