Help a girl out

How do you get someone to trust you again after you cheated on them twice, sent death threats to a person in their life they cared about and called them fat?


People really do change, and i have. I´m so much better now and i want him to see that. How do i prove to him i´ve truly changed?
If you´ve been hurt by a partner in the past, would you ever trust them again? If so, what would they need to do to prove themselves to you?