How do you set boundaries in a relationship and create new ones?

And do you give your partner consequences when stepping outside the boundary; not respecting it even though they KNOW why it is placed in the first place, they KNOW how you feel about whatever the boundary is set on.. and they still do it anyway after having multiple conversations with your partner about it. Without breaking up/divorce how do you handle that? Is an ultimatum involved? How do you get your point across to really show them that whatever they are doing is either crossing the line and or making you upset because they don’t respect you.. but say and show that they care for you…
How do you set boundaries in a relationship and create new ones?
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