Analysis your relationship by benefit analysis method as first write a sentence that I am in relationship with this...girl
And followed two colums - 1my personal benefits to being in relationship, 2 my personal losses to being in relationship.
Write all your personal, emotional, economical, social, familiel, educational, occupational benefits and losses. Result will surprise you and help you to overcome from your emotional attachment.
Next Steps
Do consult with nearest Clinical Psychologist