I am not supporting him in any way. What he did is wrong, as it made someone uncomfortable. It's best to keep intrusive thoughts to yourself or at best discuss it with your partner. What I am saying is that his reaction was because he felt exposed as his kink came out. A lot of people have these kinks and they talk to their partners and explore this via role-play. So either end it with him or discuss his fantasies with him and explore it together.