Answer:
I would say to tell her how much you love and care about her and try to talk through what factors contributed to her dealing this way and just listen I know this is what I want when I get like that
It means dont brake his/her heart
May be its just me but i think the simplest is the best: tell 'em that u know u screwed up but u are asking 4 a 2nd chance and u will be responsible now.
good luck :)