It is the maturation of friendship which makes sex so much sweeter. You must be friends before you can be lovers. Infatuation lacks confidence. When he's away, you wonder if he's cheating. Sometimes you check.
Love means trust.
You are calm, secure and unthreatened. He feels your trust, and it makes him even more trustworthy. Infatuation might lead you to do things you will regret, but love never steers you in the wrong direction. Love is elevating. It lifts you up.