Infatuation has an element of sexual excitement. Whenever you are together you hope it will end in intimacy. Love is not based on sex. It is the maturation of friendship that 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 is cheating. Sometimes you check. Love means trust. You are calm, secure and unthreatened. He feels your trust, and it makes him even more trustworthy.