Strange currently has two choices: first, tell Wanda the origin of the Darkhold so they can work together to save the world; second, fight Wanda, with a near-zero chance of winning, and then tell her about the Darkhold after losing.
Neither of these choices is acceptable to Strange.
Rubbing his temples with a headache, he asked, "Wanda, why do you want the Darkhold?"
Chapter 106