Realizing a Mistake (NaLu)

Lisanna just came back from Edolas and plans on ruining Lucy's and Natsu's friendship.Natsu kicks Lucy out of the team and so she leaves the guild.But what happens when Lucy meets the one and only Light Dragon Slayer, Sting Euclife and spends the next 3 years with him at Sabertooth? Will Natsu stay with Lisanna or wil...