Do you know and speak their love language?
If it’s not familiar to you, read Gary Chapman.
Serious wonder... do BPD significant others have an actual love language? My BPD spouse and I read the book early in our marriage to see if we could understand each-other in a more loving way. (This was before I knew about BPD). We decided she didn't just have ONE love language, she had TWO of course haha- Gifts and Quality time (as you'd imagine).
I think the danger of using the "love languages approach" for a BPD is that their need for quality time is infinite, (as is their need for gifts, etc) and more than ANYONE can provide in a healthy way. So that is why I wonder if Love Languages actually applies to people with BPD traits? What are your thoughts?