Why do you say that she clearly has no relationship interest?

People can change. She said no three years ago but she might say yes today.

You fought a lot three years ago. How much do you fight with her now?

I note that you say that you “probably” see her as a partner except for the fact that you are committed. Not that you love and prefer your current girlfriend.

Who do you love?

What if you knew for a fact that she was interested?