Caught In A Kink I Don't Share

I'm a first-year law student and have been in an exclusive relationship with Alex for about two years. We both enjoy sex and exploring various roles, but we haven’t delved into anything too extreme or risky. Recently, however, something inside me has changed. It's like a kink I've never felt before, a sudden craving to experience power dynamics that seem out of my character, dominance and submission in particular. At first, I didn't think much about it; I assumed it would pass. But the longer I ignored it, the stronger these feelings grew. The fantasies started creeping into my thoughts constantly, even during lectures or when we’re together with other friends. It was becoming increasingly difficult to focus on anything else. Eventually, I brought up this new kink with Alex. To be honest, they didn’t take it well. Alex said that while exploring different aspects of our relationship is healthy and fun, there’s a line between experimenting and crossing boundaries. They made it clear that they're not interested in these types of roleplays. Despite the initial rejection, I couldn't suppress my desires any longer. So one evening when Alex was away for work, I decided to take matters into my own hands. I set up some props, a blindfold, a few toys from my naughty toy box, and created an environment that could make it seem like someone else had broken in and prepared everything. When Alex returned home and found the setup, their reaction was immediate anger mixed with disappointment. They confronted me, saying they felt violated and unsure about our relationship’s future if I continue to act on these urges without discussing them first. It's a tightrope between respecting my desires and honoring Alex's boundaries and comfort levels. Since then, we've been having difficult conversations about how to move forward. It feels like a betrayal to have acted on this secret longing while ignoring the importance of mutual consent and clear communication in our relationship. I find myself grappling with these conflicting feelings every day, knowing that addressing them could change everything between us.