This is a good thesis Misbah. I think the key word is ‘afraid.’ I've seen emotional attachment in infinite forms. From what would be healthy emotional need to obsessive or possessive destructive types of need. Fear also ranges from healthy caution to being irrational. Perhaps the fear stems from earlier trauma. I agree, human behavior when it comes to love is difficult to understand. I think some people leave out of irrational fear and others leave because of empathy (not wanting to hurt the other).