How to get her back? please help?

I was n relation with my girlfriend 4rm 5yrs,she has broken up with me now,giving da reason dt i dnt undersatnd her,we sometimes fought n small topics and after dat i usd 2 switch of my phone and sleep.After getting fed up of making her understand.she used 2 cry but i didnt paid attention 2 hr.so she finaly dcided to brk our rltnshp,i nvr meant 2 hurt her but it happened unintentionally.