Love is so universal, it must be biological. To get the acceptance and love we need, we should understand love relationships. They are complex, sometimes starting with infatuation and sometimes with friendship. After several months, the relationship may evolve into secure, comfortable, warm attachment. Later, love may keep or loose its passion, may gain or loose commitment, may retain its positive intimacy, fade away, or become a hotbed of smoldering resentment.
Love is also paradoxical.
Like most things that give us great joy, love can also cause us great pain. We often hurt the people we love. And, although the threat of pain shouldn't stop us from loving, it does sometimes. Remarriage is the triumph of hope over experience. More than half of all children live with a step or a single parent.