We are both in our late 20's and have been together for 3 years. Our relationship is good otherwise but I am unsure how to approach this sensitive topic. There is a kink we've participated in together for the time we've been together but I am no longer into it, it leaves me feeling degraded and bad about myself afterwards now.

I know to not say yes to anything I know will make me resentful, but this obviously needs a sensitive approach as it's a potentially precarious topic that can turn out very poorly if I approach it wrong.