Have you tried working things out with your ex? Always try to work things out before turning to magic. Or at least that's my opinion. Also, relationships sometimes are meant to end. Sometimes they end for a reason. Sometimes it's better to move on than keep trying, but other times it's good to keep trying.
Honey jars are good for this kind of thing, as the user above suggested. They are slower workings, so they may take a bit of time to work.
You can get some Attraction/Lodestone oil [or a love oil of choice] , write your wish on a paper, sign it, anoint the paper and a picture of what you desire with the oil, and place them on a plate underneate a large lodestone. State your wish, feed the lodestone with Magnetic sand, and pray over it daily, keeping your work hidden from others.
SOURCE: Hoodoo Herb and Root Magick by Catherine Yronwode.