Uncomfy, I have some suggestions u may not like. Your situation is too new for both of u to know where it will lead. But, in time it WILL LEAD SOMEWHERE!

I was seeing a girlfriend on and off for over 30 years. Finally, we were both divorced and seeing each other openly. Then, Sherry showed up out of the blue!
At first, she seemed very accepting and encouraging regarding my excitement with dressing. But, that dimmed after a year or so.

I don't know if she was jealous of Sherry or simply that I was so captivated with my new "hobby". But, she broke it off with me and I haven't heard from her in 10 years!

Don't lose yourself in your SO's newfound interest. Communicate how u feel often. So you'll both be aware of your feelings. Which may change directions as his CDing developes.