The person might not be who you thought they were; might have changed for the worse; but in the memories, they will always be the person you loved. it's ok to cherish those memories. You dont have to allow that person in your life now.
There is a guy who I met last year,immediately he was the first person to talk to me! He is my best friend in the whole world now! My best friend last year and I slowly grew apart.just one year and my life is completely changed!