I think if I remember correctly because blonde changed too much. FL fell in love with him when he was a nerdy guy, but once in a relationship with her, he worked hard to become cool, handsome and sociable (like FL), getting rid of his glasses etc.
But thats not FLs type .. sighs
Brown-haired guy on the other hand was a cool socialite, but he made himself look nerdy to match FLs type and catch her attention. Which was a success :3
Honestly I feel a bit sorry for blonde. He just wanted to look better for FL and in the process lost her.
Im hooked on the story but both guys shouldn't have to change themselves for FL and she's kinda fickle on her ex changing.
Maybe there is more to the story and I remembered incorrectly, because you are right. The reason for breaking up is a bit thin if its only because he changed too much from her usual type lol...
Why did the blonde and mc break up? Did I miss something