Learning how to get your ex back
How to get your ex back and move forward is a difficult thing to figure out when someone has been hurt. Most likely it was both of you who were hurt and both of you who did the hurting. Forgiveness is essential to any relationship being mended and has to happen if you want to know how to win your ex back.
Learning how to get your ex back is going to involve learning humility on both sides. Being selfish is what got your relationship in trouble at the beginning. You decided that the individual was more important than what you two had as a couple.