I have a friend (let's call them D) who is generally very sweet and very funny. However, D is also a self loathing narcissist who manipulates people into falling in love with them to validate that they're attractive. D specifically target people with disorders like BPD (BPD almost specifically) because D is aware the people their hunting will fall wildly in love with them and stroke their ego. D always complains to me about these people wanting to get serious but D refuses to learn or grow as a person.

The sad thing is that D has the potential to be a great person, and they know they can be a great person, but D just won't make good person decisions.

Something that's bothering me lately is an obsession with a particular person (who we will call A). A was in a relationship with Ds best friend. D and A had an affair, totally destroyed the relationship, and now they're still all friendly with eachother but D is mildly obsessed with A. I'm afraid my friend is going to try and lure A into an affair again. A has a relationshop but A is already hanging around with D late at night without As partner.

D has told me before that sometimes when they make decisions that ask themselves if I would be proud of them. Whenever they're ashamed, they tell me. I'm wondering if D and A are already shagging again but D is too ashamed to tell me