What does it mean when a boy says move on he don’t want me to get too attached?

I know this guy 8 months now. We met only 2x as it’s long distance and he travels for work. He never traveled to see me and only expected me to see him. He never asked me for any dates , never met family but would act like a boyfriend without ever asking to be his girlfriend.

He was first guy to ever treat me very nicely & good. But we met on a dating app & since I missed my bus trip last nite, he just ended things with me today. And I’m shocked at how someone can do that just leave u so easily? We had a lot of things in common. But I guess he don’t care about me or found someone else in secret.
I guess it’s ok as either way I’m looking for a real first boyfriend and this isn’t a relationship. I don't know what a boyfirend is like.

What does it mean when a boy says move on he don’t want me to get too attached?
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