transitioning to having your first partner outside of your primary partner

would like to see if anyone could share their experience on the transition to establishing your first partner outside of your primary/anchor partner.

what conversations did you have to have with your primary/anchor partner before?

how did you navigate if your primary/anchor partner was not fully on board with it? what helped?

what fears about this transition did you have, if any?

what made you want to officially establish the label for this secondary partner?

what changed within the relationship with your secondary partner once the label was set?

and any other experiences are welcomed to be shared, these were just some questions i had off the top of my head.

For reference, I am the secondary partner in this scenario if it matters. I would like to be able to understand from the other side of this and see other’s experiences how to transition into these “firsts” for me & (unofficially labeled) partner. Be kind, thanks.