User blog comment:IamJakuhoRaikoben/Chapter 324: The One Who Closes The Door, Review./@comment-4489126-20130322210042/@comment-49.176.8.196-20130323010257

Maybe it Natsu and the other dragon Slayers have influenced why Lucy "closed the gate', maybe they knew that their foster parents will die due to closing the gate and therefore... Natsu and that won't exist in the "present" so Lucy would be like "I love you guys, I will not destroy them"