Sometimes, to get an ex back, you might have to learn how to be a bit sneaky. Getting back together with you might be the furthest thing from their mind, but it's all you can think about. If that's the case, you'll have to learn how to be more subtle in how you interact with them, so they don't know what you're up to.
In any breakup, there's usually at least one person who didn't want the breakup to happen; if that's you, then you'll have to be the one to try and get the relationship back together.
Here are some suggestions for how to do that without tipping your hand:
Do things that make it look like you're ready to move on and that you don't care if you ever get your ex back; have fun, go out with friends, go out with other people. Don't go out of your way to let your ex see you, but make sure some of their friends see you out and having fun. Trust me, word will get back to your ex, and if it seems like you're ready to move on faster than they are, it might get them a little jealous.
If you get a chance to talk to your ex, don't talk about all the things that you're doing; just let them know that you're happy. Let them know that you hope they're happy too. Believe it or not, this will go a long way towards making your ex want to get back with you: because you seem to be happy, and you want them to be happy too, you'll come across as being mature, stable, and independent, and these are qualities that most people find very attractive.
Give it some time. Maybe you think about them all the time, and you want them back so bad it hurts, but you don't want to let them know that: wait a couple of weeks, and then call them up or send them an e-mail asking how they're doing. Make this contact casual; sound as much like an old friend as you can. Picture an old friend who contacted you, trying to get back in touch with you, and make it sound like that.
When and if they start talking to you, just let them talk, and really pay attention to what they're saying: they'll be far more likely to be drawn to you if you listen intently to what they say (especially if that's different from the way things were when you two were together). Don't talk about yourself too much; instead, encourage them to talk about themselves.
People like people who are interested in them; by listening to them and encouraging them to talk about themselves, you are showing that you're interested in them, and they won't be able to help liking you for it.
At this point, instead of you trying to get back together with them, you may find that they want to get back together with you. By showing yourself to be a mature, stable, and independent person who's actually interested in them, you will have made yourself much more attractive to them, and you may find them pursuing you, rather than the other way around.
