The instance has arrived, and my girlfriend killed everyone for the sake of first lover

Summary

The world changed overnight. Dungeons descended from the sky, and my girlfriend stood in front of the only path to a Class Advancement.

All so her precious old flame, that cowardly bastard, could get the first pick of a new class.

But the portal was fading with every second.

Miss this, and you’d never get another chance.

Seeing that her man was late, I waited for her to look away and shoved her into the shimmering gateway.

Her beloved ended up stuck with his garbage-tier skills and died in