Hi there, I’m not diagnosed with bpd but I’ve done a ton of research and I sort of align with a lot of the symptoms. 
One of which is being hypersexual. Me (20f) and my boyfriend (23 m) have a really great relationship he is really understanding with a lot of the stuff I suffer with mentally and does his best to help me through it, but we have a lot of fight (mostly my fault) due to our different sex drives. A lot of my day I think about doing stuff w him and In my mind I sort of expect to do something every night. He on the other hand doesn’t really care about sex (his words, not sure I really believe him due to stuff in the past but I digress)  and he says that all he really wants is to cuddle and watch movies and stuff. I struggle a lot in this dynamic as it leaves me having to initiate sex most of the time. This leads me to feel like 1) he doesn’t want me 2) hates me secretly 3) I’m an ugly freak 
If we don’t do anything cause I’m waiting for him to initiate I tend to shut down and distance because I just feel like I’m really gross and unattractive and he doesn’t want me. And that’s where the conflict begins cause he doesn’t know what’s wrong and I want to tell him and talk to him about it but when I get upset I sort of like leave my body and I can’t say or do anything I just shut down. I want to fix myself cause I want to be great for him but i don’t know if I can or ever will. I don’t know what to do