You are the lucky or unlucky person to marry Bellatrix. This is set around the scene in which Dumbledore is killed.

Draco had his wand pointed at Dumbledore while he stood there hesitant to carry out his mission. Fenrir and Rodolphus were standing a little further back while Bellatrix stood beside Draco, encouraging him on his mission. No one heard Severus Snape coming up the stairs, preparing to help Draco. And certainly, no one heard you. They all knew you had come with them but didn't know where you had gone.

Bellatrix: "Come on, Draco, finish him. You can do it, complete your mission."