So they brought it up to me just two hours ago say how if I would be okay with a threesome. In my mine I was freaking out and got jealous and felt like they're going to leave me for the other person if we ever did have one. I don't think I would be okay or maybe I would but im not 100% sure. They told me its okay if I wasn't and or uncomfortable with the idea. I said maybe and explained to them about it kinda made me feel. I also asked if they just wanted that or a threesome they just said a threesome. They were very understanding they always have been and always have been patient, aswell as considering of my feelings and how I have bpd and how they're my favorite person they also have done insane amount of research about it aswell which im really happy about. But anyways I just ended up saying yes I would be okay with it because I  just want them to be happy even if it hurts or makes me split like I was 30 minutes ago. Im just honestly don't want another person touching them like that at all. Like I've had a threesome before in the past but that was with two people that weren't my fp so I was fine with it.