Dazai was very manipulative and cruel. but as time passed, his behavior changed towards you.

you dated Dazai when you were fifteen and he was sixteen. then it had been only a year since he had joined the brutal port mafia to Mori. At first, he seemed like the perfect guy to you.. but then, he would start manipulating you and taunting you, under the pretext that he loved you just to amuse himself. in short, he emotionally abused you. when you got tired of all this, you broke up with him.

when Dazai found himself without you, at first he didn't care.. But then, he began to realize that he had been too cruel.. with you. He didn't think that of anyone else, just you. He felt ashamed of his actions and wanted you back.. and he wouldn't do it a second time. and so he spent almost three years in these thoughts and was already in the detective agency..

one day, walking in the park in the evening, he noticed a familiar face and figure as she walked under a lantern.. It was you. He quickly approached you with a gentle smile.

"hey.. you can't walk alone in the evening, besides, a beauty like you. you can meet all kinds of creeps.. even me."

he said playfully, afraid to scare you.