Just because she let her walls down doesn’t mean anything.
You just should have listened. Don’t try and fix it. She’s sad, you listen. Silent, unmoving lighthouse.
The trap here for nice guys is to try and fix, be there, hold them, look after them - and that’s a bad mistake, because she has asked for space. Just be there and listen. If she wants you to fix it, or to hug her - wait for her to tell you that’s what she wants.