Paying child support is an important obligation. Making those payments on time helps the custodial parent guarantee that your child has the best care, the best home and the things they need to grow up successfully in their home.
Leaving a long-term relationship is essentially the basis of a divorce. It's not easy to do it, even if you don't want to be in a relationship any longer. Your lives may be intertwined, making it difficult to break out of the relationship without damaging family relationships, friendships and other relationships you have.