Ever loved a girl for nearly your entire life and couldn't confess to her because you know that she returned your feelings?
Congratulations, now you will understand Natsu Dragneel.
He didn't know where to begin. When they were kids,. he wanted to know her. As they grew up, they became the best of friends, but that wasn't enough for him, he wanted something more than being friends.
When looked at her, he felt mesmerized by her beauty. Her long beautiful scarlet hair. Her big brown orbs that showed nothing but determination and passion. Her curvaceous body...
He was totally in love with her.
When he rescued her from the Tower of Heaven, he always felt that it was his responsibility. Her emotional and phisycal states were his responsibilty, that's why he rescued her from her past demons and showed her that living for her fallen friends was better than dying.
Hell, he even fought the council just to stop them from taking Jellal. It hurt him. The way she looked at Jellal was like she was looking at a piece of herself.
He can still remember the last time he talked to Jellal. "If you ever hurt her, I assure you there is no place in this world will hide from me."
He remembers the way the way the azure-haired boy looked at him determinedly.
Despite being a dragon slayer, Natsu was a simple human being. He would take a shower every time he comes back from a mission. He would close the lights when he goes to sleep, but going with Erza was different.
He would never take a shower because he was afraid her scent will leave his body. He wouldn't want her enchanting smell of strawberries to go from his body, because every time it does, it would be replaced by a certain azure-haired man's smell.
He would never close the lights or the door of his house. He still hoped that someday she will be sad and will come to him to seek comfort. He always held onto the hope that someday Erza Scarlet will love bim back.
Because if she was the only light in Jellal Fernandez's life, then she is the life of Natsu Dragneel.
Even if she's what's making Jellal try to be a better man, then she is what keeping Natsu sane.
Even if she will never love him back, he still want her to be happy.