See yourself as a family living in two different homes, but still a unit connected by your child, suggests psychologist and divorced mother, Judith Ruskay Rabinor. In a Huffington Post article, Rabinor suggests that you take a deep breath before saying something derogatory about your child’s father, especially in front of your child, because she doesn’t need to hear it and you’ll feel better not saying it. She also recommends letting go of past hurts, forgiving yourself and your ex, expressing gratitude for his willingness to remain a part of your child’s life and expressing appreciation to him for his efforts whenever possible. You can build a new, friendly relationship with him if you take the high road and consider your child’s needs because the focus will be on helping your child rather than dwelling on the past.

While it's important to try to get along with each other, if you behave overly friendly with your child’s father, your child can develop false hopes that you will get back together, according to family therapist Jann Blackstone in a Bonus Families article. Set boundaries that include being cordial without sharing hugs and kisses or expressions of affection, especially in the early years following the split. Blackstone suggests a friendly but business-like relationship that put the interests of the child first and limits the amount of time you spend together being close friends.

Encourage your ex to spend time with your child and support their relationship. When your child’s father is actively involved in her life, your ex is also more likely to make his child support payments, according to a "The Future of Children" journal article. He might also contribute to the economic support of your child in additional ways that aren't reflected through child support payments, such as providing insurance, clothing, school fees and lessons. That can help you be realistic about your finances. Peace of mind can reduce your post-relationship stress. It's easier to feel friendly toward your child's father when you know that your ex would care for your child if something happens to you.

When you receive a parent-teacher conference request or schedule an important medical visit, invite your child's father to attend. Work together for your child’s best interest in all areas. Attend your child’s activities together and support your child. When you concentrate on how your behavior will affect your child, it's easier to be amicable and put your best face forward, which can help you and your child's father to be friendly with one another in your interactions with each other.