One of the 9 diagnosing criteria for BPD is impulsiveness, that's not to say every BPD person is, seeing as you only need 5 of the 9.
Just an example. An OCD person might be obsessive about washing their hands or turning the light off and on again 10 times, but yet still might go and spend £500 impulsively, or go out and have a one night stand on a whim (sorry, not great examples, but what I could come up with).
I dunno. I'm no doctor, but I don't see why a person can't do some things compulsively and others impulsively.
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