"Everyone deserves to be forgiven, no matter what they've done."
Natsu is jealous. Jealous that all of Lisanna's attention goes to Bixlow, her boyfriend. So Natsu decides that whoever doesn't give him chocolates for Valentine's Day will be his girlfriend. Okay, so what if he'd be using the girl? Its not like her feelings mattered in this situation. Well, that girl just so happens to be Lucy Heartfilia, a quiet bookworm who's admired by many guys. And a girl that's secretly had a crush on Natsu. So when she says yes to being his girlfriend, she gives all of her love and attention, but gets none in return. Soon, she just gives up and stops acting. She's become the normal, beautiful bookworm everyone falls in love with. Everyone including Natsu. He just has to face one fact. He's been using his girlfriend this whole time.