Wishing He Shared My Interest in Bondage

I met Alex during my master's program, and we clicked right away. We've been together for almost two years now, but there’s this one thing that I’ve always wanted to try but haven’t had the courage to bring up. Lately, I find myself thinking about bondage more often. The idea of tying someone up, being tied up, excites me in ways words can't describe. But every time I think about talking to Alex about it, I feel this deep sadness and loneliness. He’s an amazing partner who is open-minded and supportive, but he just doesn’t share my interest. Sometimes, when we’re cuddling or having intimate moments, a part of me whispers that maybe I should keep this little secret to myself. It's like there's this quiet, unspoken gap between us, and it feels isolating. But every time I suppress the urge, the fantasy just gets stronger in my mind. I know talking about it could change things for worse, but not doing anything about it is suffocating me too.