Here are a couple of posts from Debbie Corso of HealingFromBPD.org about “reading” others, taking on their emotions, and boundaries:
http://www.my-borderline-personality-disorder.com/2012/05/empathy-boundaries-bpd.html
http://www.my-borderline-personality-disorder.com/2012/02/borderline-personality-identity-issues.html
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