Speaking to Business Insider, relationship expert Jessica Alderson explained that these kind of relationships are a bit like an addiction, saying: “They are often characterised by extreme highs, during which relationships seem perfect and magical, followed by crashing lows, which are usually caused by a partner pulling away or acting out – this can make people feel alive.”
Article source: https://www.huffingtonpost.co.uk/entry/missing-toxic-ex-wuthering-heights_uk_6995bb90e4b0d22a80319f3f