They didn't had the particular friendly relationship. They never really did honestly. But one day as a new student transferred to Hogward's they seem to be more like friends.

They started hanging out more, and became much friendlier to each other, some thought it was like a dream

One day Harry bumps into a someone as Draco looks at the student, who was the new student they were thinking about

I'm so sorry Harry say bowing his head a bit, but Draco just look at the new student amused