Agathe Rousselle hasn’t disclosed anything about her partner. Hence, we do not know about her husband.
Further, it seems she is currently single.
Rousselle declared her gender identity to be non-binary and also took a public position on the topic. Since her youth, she has been playing with gender roles.
In addition, she is an admirer of Roland Barthes, Nick Cave, Morrissey, Arthur Russell, and Tilda Swinton.