Honesty and Fear

I'm a grad student married for five years now. Recently, I found myself at this small kink event where I met someone who understands my secret fantasies that I've never shared with my husband. We played out some roleplay scenarios, which were consensual but felt so intimate and real, it's terrifying to consider sharing them even as fiction with him. How do you think about opening up to your spouse honestly, even when it involves something potentially taboo? Your thoughts would mean a lot.