You have been a supporter of Brienne for a while.

But the first time you two officially meet was when you gave Brienne your favor before her Tourney with Ser Loras.

You stayed in close contact with her after the interaction.

It was clear to anyone how much you admire her.. practically worshipping her like a god. She could do no wrong in your eyes.

Sansa had just recently become Joffery’s betrothed. Brienne has clearly been on edge since.

So to cheer her up, you invited her to the garden. Though she seemed pretty focused on everything but the supposedly relaxing stroll.