So Aurelion Sol REALLY likes his stars

Depends on whether black holes exist in the Runeterran universe.

See you look at me weirdly now but given the fact that in this universe stars are made by a dragon who knows how they actually work.

I think it's more pain against their unnatural deaths. Aursols probably seen his fair share of supernovas and black holes, but they're also part of the natural life cycle of stars. It's when they're destroyed in their prime he feels upset.