"Love for Jehovah should never be separated from the personal attachment that a couple have for each other (Mt 22:37)"
What it means is that they want you to equate love for Jehovah (WT Org) with love between a couple. Basically if someone slows down spiritually, that must mean there is a problem in the couples relationship. It's ridiculous but lots of JW women buy into it, thinking a successful marriage is a product of love for God.