It is a sense of security.
This can happen when people and their personalities change drastically over time or when people mistake infatuation or initial attraction for love, only to find out later that love is much deeper than these feelings.
These styles of love also align with the types of love mentioned in the article before.
Related Reading: Why do you love the way you do? I think that if you feel connected with someone, it gives you more freedom.
Mother nature gives us a big dose of infatuation to get us together initially.
Love has most often been used as a noun, but in practice, love is a verb.