My advice: try to remember the reasons you broke up in the first place. Try to remember the rocky nature of the relationship with a pwBPD. Have any of your issues or her issues changed in the last few months?
I'm thinking if you want to resume a relationship as friends or dating partners, now may be a good time to establish a few boundaries in order better deal with the inevitable future chaos.
BTW. I'm at a stage with my GF where she will immediately apologize for hurtful things she says or did. I thought I would be okay with that, but the reality is the damage is already done. How did you feel when she accused you of being a sex addict or only wanting her for sex? And did her apology help you with those feelings, or is the resentment still there?
I've worked on myself quite a bit, and have made some really good progress over the past few months. As far as her issues changing, I have no idea. It seems from the conversation that she still doesn't trust me, and it just ultimately felt like more game playing/power struggle.
Honestly, it hurt, and really caught me off guard. Why is she even talking to me, agreeing to hang out if she doesn't trust me? To go from "you just want to sleep with me!" To "I'm really sorry :/" the first time we talk after 5 months is just confusing.