Well... I'm not surprised. Disappointed, but not surprised. We all knew this Supreme Court was not in favour of its citizens. The Supreme Court should have been stacked long ago. Leaving it be with its insane appointments just because stacking it might start a war with the GOP was a short sighted move, as the GOP is always going to play underhanded (that's how they managed to get so many SCOTUS appointments in the first place). Biden's insistence on trying to play nice with the GOP has always been his weakness.
This really sucks for those with student loans who were depending on this. We're already in an economically rough place for the kinds of folks who would have student loans. Inflation has been sharp in recent years and wages have not kept up. In my field of tech, layoffs have been widespread and new grads would be the most severely impacted (they already struggle to get hired and now they're competing against an increased number of experienced people).
As an aside, it's also a shame that lawmakers have not managed to pass a law for this debt relief. My understanding is that the strike down is specifically because it's not a congress passed loan forgiveness. But congress isn't willing to do the right thing (not in enough numbers to pass a law, anyway).