If you get into relationships with people purely because you cannot be alone isn't that a bit narcissitic?
No! Narcissism is just the opposite. Narcissists are avoidants until they are rejected. They are hooked on self conceit. People who cannot be alone are lonely and afraid of being alone. Usually because of childhood trauma. It also shows a lack of self-esteem. In other words, you cannot enjoy your own company. Most of all it is a spiritual wound. You cannot feel a loving relationship between you and God.
It is wonderful to seek out people to be with. But you must not put all your eggs in one basket. You must not fall in the trap of thinking you only can enjoy romantic relationships. When you think you cannot live without romance or a particular man, you run the risk of getting addicted.