What does it mean to have an affinity for someone?

The awareness of your other half brings you a sense of alleviation and comfort. Even the most diminutive thought of that person captivates your entire mind and enthralls you. The essentials of life: the demands of nourishment and slumber, drifts into the back of your mind as the all-consuming thought of serenity induced by the mere sight of that one commences and isolates itself within your consciousness. The restlessness transforms itself into fanaticism. The affections impart fulfillment. Your soul is whole and you are complacent. It didn't just happen. It happened for a reason.