SET is a productive way to communicate in my relationship with RABF. As long as he hears the S and the E, he feels safe enough to venture into the T. Since I sincerely do feel supportive and the empathetic feelings (now), it's an easy thing for me to do.
It doesn't feel like walking on eggshells to me, but more like a way of communicating my love for him. It does feel natural.
A few months ago, when all I could feel was resentment, it would not have felt natural, and I would've felt like a fraud if I attempted this approach.
Thank you for putting this strategy into words. I didn't even realize I was practicing it, but now that I think about it, it is working well.