Do you care if your SO has pictures of his ex??

Sarah
My SO was in a relationship with his ex for two years and seven months. He burned all of their memories with his friends, but he kept a flash drive of ALL their pictures (we have 400 pictures six months in), their prom picture, the customized puzzle his ex made him and the blanket she made him. His excuse is that because she was apart of his life, he would want to show our kids that part of his life. Would you care? Because I'm having an emotional breakdown since I don't think it's okay. I'm 18, he's 20. They were high school sweet hearts, lost their virginities to each other and I lost mine to him.