Breaking up with someone you really like does not have to be permanent and you can regain their love and rebuild the attraction they have for you by doing and saying certain things at the right time. Knowing what to do and say is a skill that needs to be learned and practiced in order to perfect.
When you are trying to get ex back you need to stay in control of the situation and not reveal your true emotions, no matter how desperate you are to get them back. Acting the opposite way to how you feel is a good way of going about it as it will show how strong you are and keep you in control.