I love him

I love my Grizz so much.
But I know that someday I will have to stop being his submissive.
Someday, if I meet someone and fall on love again. I'll need to let him be my Dom.
It makes me cry to think of it.
But I also wonder, how would that work.
Would he need to ask Bill permission. Is another Dominant man going to be OK with that?
Would I ask Bill's permission to have sex with him?
I just mean the logistics of it.
I know, he does not want me to become distracted from my goals. I don't want that either, and I know that falling in love would be very distracting, even dating would be distracting.
I'm not actively looking, but, if I do happen to meet someone, what do I do? Do I tell Grizz that I've met someone and I want to date him? The thought that I would hurt my Grizz with those words breaks my heart. How could I ever say them.