Ending + revenge

Such spells are impossible. Science is a type of magic, and so is nature, but not revenge spells. You must take action and perform your own type of magic. Cast a curse, then find ways to get them back. Do it either lightly or very harshly. I warn you though, it may have severe consequences. Another way is look for the signs the universe and the spiritual part of yourself gives you. Signs can be literally anywhere, and it takes a careful eye to find them, plus the signs must be related. If you have a question, ask the universe and it will send signs to your spiritual self. The suggested question for you is, "How must I punish the one that fails to be there for my well being?" Then later, it is up to you to find the signs. After finding out, take revenge. I hope it helped. If it didn't, then I'll find some other way.