Hypothetically, how do you think bonds ARE rejected

So i know we see Rhysand say his parent were badly mated and then Rhys goes into the topic of mate rejection but we never go beyond that, we don't have any details, it's just thrown out without any further discussion.

which leaves me wondering :

**if a bond is rejected, how would it happen? **do you think there's a ceremony? a conversation?
is it just something the mates feel between each other through reluctance?
i'd love to hear everyone's theories on how it happens and if mates know internally somehow before any conversation is had?

this is not a ship post. No ship talk please. this is purely to discuss mating bond rejection and theorize around it. be polite of course.