User blog comment:CNBA3/Fairy Tail Movie 2 Ideas!/@comment-74.96.87.163-20140408000647/@comment-7418318-20140613084114

I agree.

As I said back in April, Lucy's past doesn't leave much room for old friends and crushes, so going from Natsu's end might be more fitting. Maybe he got a temporary girlfriend after Lisanna "died", but once he realized that he wasn't really feeling anything for the girl, but was only subconsciously trying to fill the gap that Lisanna left, he stopped the relationship.

This could leave the ex-girlfriend open for a variety of psychological problems, making her loving and caring when Natsu was around, but abusive and manipulative toward Lucy when he isn't, doing all in her power to break the two apart and win Natsu for herself. For story purposes she would obviously have to have limited success in the beginning, but ultimately be exposed.

That would also leave the option open of Natsu and Lucy not committing to a relationship yet due to the happenings of the movie. Natsu believed the ex more, making Lucy believe he doesn't want her, while Natsu feels guilty and unworthy of being with Lucy for not trusting in her.

Though I guess if it absolutely has to be Lucy's old flame, I could be a business partner of her father's (or rather the son of a business partner, who accompanied his father at a visit of the Heartphilia mansion) that she got a crush on in the past, when he came to visit her father. That would have the advantage of Lucy not really knowing anything about him except for the facade he puts up and thus leave the possibility of him turning out to be bad news in some way without us having to wonder how Lucy could ever become friends with him.