The best way to cope with your parent's divorce is by getting your feelings out.
Then, you can try to adjust to your “new normal” and focus on living your life again.
You may have to move to a new place and leave behind your old friends.
Even if you don't have to move, you may have to adjust to having two homes and deal with your parents dating new people.
As frustrating as this can be, your son's behavior is quite natural. If he's just gotten used to you and his father not being married, he might now fear that a stepparent will further complicate things and take up your time.
Children are expected to form strong attachments to both parents, to the notion of a strong family unit, as well as, the notion of two parents together in one home.
Divorce involves the collapse of many ingrained social expectations for the child.
Deep inside, most children, no matter how tough they may seem to be, become frightened, confused, insecure, vulnerable, hurt, depressed, overwhelmed, angry, and conflicted in their emotions toward each of the parents.
Since 1958, when there were 2.1 divorces per 1,000 population, a gradual increase in the number of divorces has occurred, peaking at 5.3 per 1,000 population in 19 (Glick & Lin, 1986), and stabilizing at 4.7 as of 1990 (US Department of Health & Human Services, 1990).
According to projections based on 1990 census data, 40% of all children can expect to live in a single-parent household because of divorce before the age of 16 (Cherlin, 1992).