Also, I found a couple articles that you might find helpful in trying to understand what you've got on your hands, and perhaps some means of handling it. Fetishistic Disorder | Psychology Today To help understand the line between harmless fetish and a fetish disorder.
This one to provide some ideas for what handling it might look like. How to Handle Your Kink - Jessica Wildfire - Medium

At some point, you WILL have to find a way to communicate with your partner about this. The key to any healthy relationship is to be able to have open and honest communication between the parties involved. But it always helps if you have a good grasp on the subject you're trying to discuss, all the better to articulate your position and perspective. If she values the relationship, she too will need to be prepared to communicate with you about this.