BPD gf[20] and I[26] having difficulty with open relationship

So we both decided, a fairly short time ago that we should retry the open relationship thing. We both got OKcupid accounts, specifically looking for friendships and casual sex, and making it clear that we were already in an open, but very committed, relationship to set those boundaries.

She knows on a rational level that I will be propositioning people for sex (which admittedly is an intimate act by its nature) but becomes angry at it. Unintentionally, she acts hypocritically because she (and I) are okay with her doing things with other people, but she has difficulty when I even try.

Now, she isn't actually diagnosed with Borderline Personality Disorder--she is Bipolar type I, though--and we recognize that self-diagnosis has its drawbacks and risks....but she has behaviors which fit much of the diagnostic criteria for BPD, and we're kinda approaching issues and situations as though she had BPD.

Anyway, we need some advice.....does anyone agree or disagree that her reaction to me seeking casual sex, as she is herself, is appropriate? Why?