After the thrid task, Harry and Fleur end up in the hospital wing, neither being able to talking the whole night and become friends through that. They exchange letters throughout the summer and Fleur can plainly read how miserable he is. So she comes to Number 4 to visit him and is shocked by how he is (nightmares, grief) and how he is treated. To avoid an incident, Harry drags her to a park where they have a talk and Harry reveals all that he has been through while Fleur just holds him close and does her best to be there and comfort Harry, cradling him against her chest, stroking his hair and the like