I work with clients who have BPD. It is a long standing personality disorder that is characterized by deep fears of abandonment and emote spud swings of emotion. Often people who are diagnosed with this have noticed that they are hypersensitive to real or perceived rejections. It is often very difficult to see things in shades of grey, everything is either all good or all bad. This frequently creates difficulty in relationships, so it would probably be multiplied in multiple relationships. There is a very effective treatment though called Dialectical Behaviour Therapy. Most clients involved in this improve significantly and rapidly. As a care provider I am very familiar with the idea of DBT. Anyone can benefit from it!