How Can I Get Her Back If She Cheated & I Ruined Her Stuff?

My Ex and I had been going together for almost 3 years, but in those 3 years it felt like 30 years together. I thought we'd be together forever!! Then I made a mistake by not cherishing her as much as she needed, due to trying to make more money for us to have a great vacation on our Anny (April 20th) cuz some of the romance had dwindled. I'm 31 and she's 25. Anyways one day she told me she was moving out so we can miss each other and respark our romance. I thought it was an EXCELLENT idea. Then I found out there was another man!!! So I scissor-ed most of her clothes and lotions and cookbooks. I felt like such a chump. Anyways that was on March 4th. When she came over to move the rest of her stuff out, her Aunt thought that it that it was typical of me to do something like that? I may look intimidating but I'm really a laid back guy. So she's telling her family that I am a mean person who nearly abused her. I just miss her so much and I really want to win her back. Any suggestions?