Dorian cannot face up to what he has done. He wants to avoid even going into the room with Basil's body, but remembers that the portrait is uncovered: "He opened the door a little wider, and walked quickly in, with half–closed eyes and averted head, determined that he would not look even once upon the dead man. Then, stooping down, and taking up the gold–and–purple hanging, he flung it over the picture."
What does "determined" mean?