Without intervention this way of thinking is difficult to change. Obsessional thinking is a treatable condition, often triggered by loss, whether real or perceived. Counseling can bring relief to sufferers. When romance begins a couples' need to connect may seem almost insatiable. Each day is focused on one's contact with the other.
Every revelation seems like a miraculous discovery.
As time passes the two should become more comfortable and trusting of the relationship. It is not necessary to spend every minute together. Each is again able to function and develop individually as well as within the partnership. But in some relationships one or both may be unable to accept this healthy individuation. If one spouse develops interests which do not involve the other, the more dependent partner feels both threatened and abandoned.