When I love somebody romantically, I usually tell them straight away. With Carol, I waited until several months after my transition.
The ethics-based reason was that if I told her I loved her before I told her I was transitioning, and we started dating, it would be unfair to spring my transition on her a few months later. Carol is an open-minded woman, but that is a large pill to swallow.
The other reason I waited is that if she liked me, I might have chickened-out on my public transition, which needed to happen. I wanted to ensure the transition occurred.