when you are dating or in a relationship as a person diagnosed with bpd, it’s important to have safe words. im not talking about when in sexual situations (though that might be a neat idea too) but just for everyday-use. use a certain word when you are splitting or dissociating so your partner will be aware.
also when you are being triggered, either by your partner or something/someone else, a safe word is a great tool. especially when you are in a crowded place, so your partner can help you get somewhere quiet.
a safe word can also be needed when you are in a fight with your partner and one of you crosses a line. then you’ll be able to either apologize, stop the fight or take a “time out” - a few minutes apart to cool your heads.
you might also not need it at all, but i think it’s a good idea to have one, just for safety measures? idk, it has just saved me a lot of crying and maybe even a broken heart.