You could also both be hallucinating.

Collective delusion/hallucination is a real thing. Often reinforced when like minded individuals form a tight social group that serves to isolate them from anyone who might challenged the hallucination, and who seek to reinforce it in each other.

Human beings are prone to mass hysteria because we are social animals, and our 'truth' about the world is largely a construct of our agreement with our peers. Psychological illness and behaviors, like anorexia, paranoia, etc. are transmissible psychological conditions. They are ideas in your head that eventually become the truth of your reality as they are reinforced by the ideas and realities of the people around you, and part of the drive to do that is for people to have their ideals/realities validated by others.