Not being interested in what you are interested in does not necessarily mean that this guy is too busy. It might simply be a reflection of who he is - i.e. he does not watch movies, does not listen to music, is reluctant to share about himself and cannot engage with you on topics that you resonate with.

You do not seem to have much, if anything, in common. I wonder what you get out of this relationship?

It is hard to sustain a relationship without anything in common or when the other withholds about themselves. He seems pretty sketchy actually.