I know that perhaps this may be controversial, but in my personal opinion, the end goal for any borderline seeking stability and healthy relationships in their life should be to unpack and move away from the FP dynamic.

Now, obviously, your brain will subconsciously form these attachments and there's no helping that, it's just a part of the disorder. I don't expect anyone to just decide to not have an FP.  But being able to notice when you are forming the FP attachment and checking yourself is a really crucial part of growth.

An FP relationship will never be truly healthy for you or for the FP, because the extreme idealization and fixation on one individual will lead to splitting, codependency, and lack of relationship boundaries.

I think that a part of being able to achieve healthy and fulfilling relationships with other people is to be able to recognize when we are engaging in BPD behaviors towards them, and trying to move ourselves away from that.