Hi, Reem here.. Allow me to make a few corrections here..

improving my skills. help me please :)

Divorce is one of the most stressful events in a person's life because it is not only the division of two people, but also the division or destruction of a family and the children suffer a lot with that.
A couple needs to know everything about each other, that point is essential because if you know the good and the bad attributes or attitude of your spouse/partner, you can build a wonderful relationship or it might end before you get married.
In future you will enjoy a wonderful marriage and life forever in love with children, or face the pain of you seeing your children crying for their father or mother in a court.

Let me explain :

1) events in a person's life : I added " 's " after person because it shows possession. eg . Diego's essay about divorce.

2) is not only the division of two people, but also the division : Not only is always followed by but also in a sentence. eg : Not only is Diego's essay about divorce logical, but also wonderfully written.

3) A couple needs to know : I used "needs" because although couple means 2 people, it is a collective noun and is seen as one. So as an exception to the rule, we would treat it as singular. eg: A COLLECTION of Diego's essays IS published in that book.

4) bad attributes or attitude of your spouse/partner : Your words were just out of place. "Bad face" can be better written as attributes, meaning qualities. "Your couple" is incorrect. It's Spouse (when refering to a partner in marriage) and Partner (while refering to a partner out of marriage).

The rest of the corrections are not strictly grammatical errors, they are merely suggestions to make your essay sound beautiful.

Good Luck with your learning !!!

Love,

Reem.

Corrections in red.  Stylistics in blue.

Improving my skills. Help me please :)

Divorce is one of the most stressful events in a person's life, because it is not only the separation of two people, it is also the division or destruction of a family; and the children suffer a lot with that.
Each member of a couple who are dating needs to know everything about the other person.  That point is essential, because if you know the good and the bad side of your partner, you can build a wonderful relationship, or end it before you get married.
In the future you will either enjoy a wonderful marriage and life, forever in love, and blessed with children, or you will experience the pain of seeing your children crying for their father or mother in a court.