How to get a boy you have dumped back?

there is this boy tht i was going out with but like we neva kissed...... and neva saw each ova out of school so i dumped him but i neva wanted to but he did so lke i said it 1st but he liked this ova girl so he whent out with her but now there not going out i know he now like this ova lool but she dont like her but i just cnt get over him how can i make hi like me????