In the wizardry world he hid his feelings for her, showed little to no affection in public, always stayed a distance behind when walking. She told him she understood why, for their safety from those who want the best for her and the worst for him. She never tried to hold his hand when others were near.
In the muggle world he laughed freely, held her against him as they passed people on the streets. There he wasn't afraid, no one knew him there, no one cared. She thought of any reason to retreat there, any reasons to be held.