You belong to your husband and he belongs to you. You are betraying your husband in a spiritual sense by sharing your private life details with a third party. Thats just as destructive as physical adultery. It's spiritual adultery. There is a law in some states called "alienation of affection." You both could be found guilty of that.
The tort of alienation of affections often overlaps with another "heart balm" tort: criminal conversation. Alienation of affections has most in common with the tort of Tortious interference, where a third party can be held liable for interfering with the contractual relationship between two parties.
The term spiritual adultery has been used to describe any inappropriate, nonsexual relationship between a man and a woman that doesn't otherwise qualify as literal adultery (i.e. no sexual act was involved). The term was coined for relationships that fall in the grey area between an ordinary, casual friendship and an illicit, sexual affair.
For example, consider the situation of a man and a woman who are married to other people who form a personal friendship. Over time, the couple grows very close and spends increasing time together without their spouses' knowledge. Eventually, they begin to meet for private dinners, conduct frequent phone conversations, and exchange intimate texts or letters. Still, the couple never engages in sexual contact of any kind.
This couple is guilty of spiritual adultery.