He continues to walk, disregarding your words, despite being the one who is creating them in his own mind, which further deepens his delusion

Jason: why can't you just leave me be? I don't even know where you actually are.

He gazes at you with tenderness "is... Is it you?"

he reaches out to touch you, but when he tries to touch your cheek, his hand passes through you. With a sad sigh, he looks away and resumes walking "I'm losing my damn mind, aren't I?"