Never Forget Nor Forgive

A story of a young boy who has been an outcast his entire life. He later finds out he not a normal human. He is a mage, a reincarnated human that has discovered a grimoire. He is not an ordinary mage he is the most reincarnated mage in all history. If that wasn't weird enough, he is re-meeting people from his previous lives. The one problem with his immense power is every time he uses it the memories from his past life overwhelm his mind, causing him to pass out.