Owen recently presented for treatment because of problems in his interpersonal relationships. He reported that he and his boyfriend of six weeks had just broken up and that he (Owen) was distraught...

Owen recently presented for treatment because of problems in his interpersonal relationships. He reported that he and his boyfriend of six weeks had just broken up and that he (Owen) was distraught because he had thought they were going to get married. Since the break-up, he had been engaging in self-harming behaviors such as cutting and was considering attempting suicide. Owen reported, “How am I supposed to live without [my ex-boyfriend]? I don’t even know who I am without him!” When questioned, Owen reported several brief relationships over the past few years in which he had immediately idealized his partner(s) at the beginning of their relationship and about which he had felt just as distraught and empty when they ended. Owen’s presentation is most consistent with a diagnosis of:

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