There is absolutely no reason to finish every quilting project you start, and even less reason to feel guilty about it. You don't have to put it away for later, you don't have to donate it somewhere, you don't have to cut it up and make something else out of it. You are allowed to stop doing things that don't bring you pleasure or make you feel good about what you're doing. You don't have to justify that in any way to anyone. Move on with your life and make a quilt for your son that brings you both joy. You deserve nothing less.