1 - Be strong. No one needs the needy, and this saying applies very well when it comes to broken up relationships. You need to stop begging, clinging or exhibiting the behavior of someone who is feeling desperate. Let your ex think that you have moved on just fine without them by acting strong and moving on. When you've moved on, your ex will realize that they have not.
2 - Minimize communication. Closing the doors of communication may appear counterintuitive when your primary focus is to rekindle things, but it is one of the most important steps when getting back at your ex or getting your ex back. Take a break from your ex, close off communication, and let him or her stew for a little while without any contact. This will allow your ex to clear his or her mind and realize how valuable your relationship was.
3 - Be flexible. Do not be forceful with your ex, demanding that they move out, or pick their things up by a certain date. Be flexible, be a listener and a sympathizer. Your ex will be surprised when they see this side of you, and it may inspire them to build the lines of communication that were lacking when the breakup came into play.
4 - Get the heck out! This is no time for you to be alone. Call your friends and get out of the house. Develop a social network and enjoy some entertainment in your life. This may not mean you need to date, or even pay attention to the opposite sex, but you do need to be getting out and enjoying your time with your friends. Not only will this be therapeutic for you, but it will also help convince your ex that they lost a gem.
5 - Simply be yourself. There was a really good reason for why you and your ex had a relationship to begin with, so go back to being yourself and let your ex remember why they loved you in the first place. This renewed self perception of your own self will surely rub off on your ex as well.
These are five simple ways that you can get back at your ex (in a way) without ruining your chances of getting back with him or her. Remember, to get back at your ex so you can get back with your ex, you have to be strong, minimize communication, be flexible, get the heck out, and just simply be yourself. Follow these tips closely, and you'll do just fine.