The Leo man is not the type of guy who will let a girl go without a fight. If you want him to regret losing you, then keep in mind that this Prince needs his ego stroked regularly, or he will get restless and seek out new adventures. Show him that he's missing out on something great by breaking up with him. This may well be the only way to win his heart in the end. You can do this by being attentive, taking care of his every need, and ensuring he knows how much better off he is with you than anyone else.