Become successful, prominent in the community, and charming. Get her to fall madly in love with the new you, propose in the sweetest way, and plan her dream wedding.
Then sudden twist. Dump her ass on the night before wedding in as cruel a way as possible then go on an interstate spree and murder between 50 - 100 random women via strangulation or blunt force trauma. Get arrested, convicted, notoriety and die by execution.
Everyone will recognize your deeds. Everyone will know she once dated you. That'll show the bitch.