Sorry to be so blunt, but don't be a wuss.
This is for both men and women, you have to take the pro-active approach as opposed to the re-active approach where you plead and overextend yourself to be reconciling to your ex boyfriend or girlfriend.
So what is the pro-active approach to getting your ex back? Let me give you the three essentials.
First, stay away.
Break contact, you have to start the process of him/her starting to "miss" you; and there can't be any reuniting if you are always hanging around, right? You have to give your ex boyfriend/girlfriend some space to; it's considerate of them, and it allows them to reconnect with themselves unencumbered by your insistent self.
Sometimes you have to be willing to let go of something before it comes back into your life.
Second, now that you are successfully broken away from your ex (but our aim is not forever), you now have time to work on yourself.
You need to work on your attitudes, your personal habits, and you may need to work on your self-presentation.
Nobody wants to be around a sad-sack, you have to start acquiring the habit of being positive, hopeful, and self-confident; these are universally attractive qualities for men and women.
You are recreating yourself for your eventual return to your ex.
Start eating wholesome food, getting exercise, and maybe a new wardrobe.
If you look good and you feel good because you're in shape; you will have another universally magnetic quality in your favor.
Further, when you work on yourself it is because you really care about yourself, and everybody is always attracted to people with a good sense of self-esteem.
Thirdly, you need to accept that your relationship with your ex is now moved to another place, you have to accept that you are now "friends" with your ex and that you have "moved on".
Now this is a little bit of a deception, because you're really trying to get him back; but you have to almost believe it yourself.
There is another reason why you're doing this: you always want most what you can't have.
If you ex now sees you as a girl/guy who has moved on and may be involved with other people, you are now someone they "can't have" anymore, but that only intensifies the underlying tension of him/her wanting you back all the more.
This is a variation on the playing hard to get strategy, but a subtler one.
Now if you can employ all these tactics (plus a few others) with patience and faith that it will have a deep affect on your ex, you are almost certain to have success in getting your ex back.
Since you've been working on yourself now you may find other men/women who are becoming interested in you to, which is not a bad thing either.
There is more to this art of getting back an ex, and you can investigate some good relationship websites to give you more info.
Good luck!