Don’t delete the pictures. Maybe delete the messages and maybe even his number if it helps you sleep at night but do not delete his pictures.
Don’t delete them because those are moments you’ll want to look back to. One day, when you’re 25 and happy with your life, you’re going to want to look back at the boy who broke your heart when you were 16. You’re going to want to remember what it felt like to be with him and love him.
It might kill you inside, looking at his blue eyes each time you open a picture. But trust me, don’t delete them. He once made you happy, he was once an important part of your life. Let him be a lesson and look back at the memories with happiness.