One of my kids is thrilled to stay in touch with me. We FaceTime most days. I offer them support and advice. My other kid only reaches out, or even responds to my texts, when they want money.
Today, I release the devil I know in both him ("step-dad" stereotype personified) and my ex-wife. I hope that their mutual anger and unresolved pain can find resolution at some point in their lives. I no longer have to give him a centimeter in my heart.