Seriously ...
The biggest mistake that makes a man when he wants to return his love that does not give her enough time to think about what she did wrong. You should give her time to her to think what she did. If you live together, then relocated for some time to your friends or you can move to another room.
You must show her that you can live without it. To do this you must look good. Make a new haircut, buy new clothes. Looks trendy. Meet new people. Be energetic, positive, smiling, joking with everybody. Show everyone that you are not depressed. Go to parties. You can even flirt with the girls, but only a flirtation, nothing more, no kissing and sex.